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2307 lines
98 KiB
2307 lines
98 KiB
# core-js |
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[![Sponsors on Open Collective](https://opencollective.com/core-js/sponsors/badge.svg)](#raising-funds) [![Backers on Open Collective](https://opencollective.com/core-js/backers/badge.svg)](#raising-funds) [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/zloirock/core-js?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![version](https://img.shields.io/npm/v/core-js.svg)](https://www.npmjs.com/package/core-js) [![npm downloads](https://img.shields.io/npm/dm/core-js.svg)](http://npm-stat.com/charts.html?package=core-js&author=&from=2014-11-18) [![Build Status](https://travis-ci.org/zloirock/core-js.svg)](https://travis-ci.org/zloirock/core-js) [![devDependency status](https://david-dm.org/zloirock/core-js/dev-status.svg)](https://david-dm.org/zloirock/core-js?type=dev) |
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## As advertising: the author is looking for a good job :) |
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## [core-js@3, babel and a look into the future](https://github.com/zloirock/core-js/tree/master/docs/2019-03-19-core-js-3-babel-and-a-look-into-the-future.md) |
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## Raising funds |
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`core-js` isn't backed by a company, so the future of this project depends on you. Become a sponsor or a backer [**on Open Collective**](https://opencollective.com/core-js) or [**on Patreon**](https://www.patreon.com/zloirock) if you are interested in `core-js`. |
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--- |
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<a href="https://opencollective.com/core-js/sponsor/0/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/0/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/1/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/1/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/2/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/2/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/3/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/3/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/4/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/4/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/5/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/5/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/6/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/6/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/7/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/7/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/8/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/8/avatar.svg"></a><a href="https://opencollective.com/core-js/sponsor/9/website" target="_blank"><img src="https://opencollective.com/core-js/sponsor/9/avatar.svg"></a> |
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--- |
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<a href="https://opencollective.com/core-js#backers" target="_blank"><img src="https://opencollective.com/core-js/backers.svg?width=890"></a> |
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--- |
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**It's documentation for obsolete `core-js@2`. If you looking documentation for actual `core-js` version, please, check [this branch](https://github.com/zloirock/core-js/tree/master).** |
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Modular standard library for JavaScript. Includes polyfills for [ECMAScript 5](#ecmascript-5), [ECMAScript 6](#ecmascript-6): [promises](#ecmascript-6-promise), [symbols](#ecmascript-6-symbol), [collections](#ecmascript-6-collections), iterators, [typed arrays](#ecmascript-6-typed-arrays), [ECMAScript 7+ proposals](#ecmascript-7-proposals), [setImmediate](#setimmediate), etc. Some additional features such as [dictionaries](#dict) or [extended partial application](#partial-application). You can require only needed features or use it without global namespace pollution. |
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[*Example*](http://goo.gl/a2xexl): |
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```js |
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Array.from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3] |
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'*'.repeat(10); // => '**********' |
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Promise.resolve(32).then(x => console.log(x)); // => 32 |
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setImmediate(x => console.log(x), 42); // => 42 |
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``` |
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[*Without global namespace pollution*](http://goo.gl/paOHb0): |
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```js |
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var core = require('core-js/library'); // With a modular system, otherwise use global `core` |
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core.Array.from(new core.Set([1, 2, 3, 2, 1])); // => [1, 2, 3] |
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core.String.repeat('*', 10); // => '**********' |
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core.Promise.resolve(32).then(x => console.log(x)); // => 32 |
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core.setImmediate(x => console.log(x), 42); // => 42 |
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``` |
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### Index |
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- [Usage](#usage) |
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- [Basic](#basic) |
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- [CommonJS](#commonjs) |
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- [Custom build](#custom-build-from-the-command-line) |
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- [Supported engines](#supported-engines) |
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- [Features](#features) |
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- [ECMAScript 5](#ecmascript-5) |
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- [ECMAScript 6](#ecmascript-6) |
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- [ECMAScript 6: Object](#ecmascript-6-object) |
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- [ECMAScript 6: Function](#ecmascript-6-function) |
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- [ECMAScript 6: Array](#ecmascript-6-array) |
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- [ECMAScript 6: String](#ecmascript-6-string) |
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- [ECMAScript 6: RegExp](#ecmascript-6-regexp) |
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- [ECMAScript 6: Number](#ecmascript-6-number) |
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- [ECMAScript 6: Math](#ecmascript-6-math) |
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- [ECMAScript 6: Date](#ecmascript-6-date) |
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- [ECMAScript 6: Promise](#ecmascript-6-promise) |
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- [ECMAScript 6: Symbol](#ecmascript-6-symbol) |
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- [ECMAScript 6: Collections](#ecmascript-6-collections) |
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- [ECMAScript 6: Typed Arrays](#ecmascript-6-typed-arrays) |
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- [ECMAScript 6: Reflect](#ecmascript-6-reflect) |
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- [ECMAScript 7+ proposals](#ecmascript-7-proposals) |
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- [stage 4 proposals](#stage-4-proposals) |
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- [stage 3 proposals](#stage-3-proposals) |
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- [stage 2 proposals](#stage-2-proposals) |
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- [stage 1 proposals](#stage-1-proposals) |
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- [stage 0 proposals](#stage-0-proposals) |
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- [pre-stage 0 proposals](#pre-stage-0-proposals) |
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- [Web standards](#web-standards) |
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- [setTimeout / setInterval](#settimeout--setinterval) |
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- [setImmediate](#setimmediate) |
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- [iterable DOM collections](#iterable-dom-collections) |
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- [Non-standard](#non-standard) |
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- [Object](#object) |
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- [Dict](#dict) |
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- [partial application](#partial-application) |
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- [Number Iterator](#number-iterator) |
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- [escaping strings](#escaping-strings) |
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- [delay](#delay) |
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- [helpers for iterators](#helpers-for-iterators) |
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- [Missing polyfills](#missing-polyfills) |
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- [Changelog](./CHANGELOG.md) |
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## Usage |
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### Basic |
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``` |
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npm i core-js |
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bower install core.js |
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``` |
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```js |
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// Default |
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require('core-js'); |
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// Without global namespace pollution |
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var core = require('core-js/library'); |
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// Shim only |
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require('core-js/shim'); |
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``` |
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If you need complete build for browser, use builds from `core-js/client` path: |
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* [default](https://raw.githack.com/zloirock/core-js/v2.6.9/client/core.min.js): Includes all features, standard and non-standard. |
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* [as a library](https://raw.githack.com/zloirock/core-js/v2.6.9/client/library.min.js): Like "default", but does not pollute the global namespace (see [2nd example at the top](#core-js)). |
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* [shim only](https://raw.githack.com/zloirock/core-js/v2.6.9/client/shim.min.js): Only includes the standard methods. |
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Warning: if you use `core-js` with the extension of native objects, require all needed `core-js` modules at the beginning of entry point of your application, otherwise, conflicts may occur. |
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### CommonJS |
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You can require only needed modules. |
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```js |
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require('core-js/fn/set'); |
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require('core-js/fn/array/from'); |
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require('core-js/fn/array/find-index'); |
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Array.from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3] |
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[1, 2, NaN, 3, 4].findIndex(isNaN); // => 2 |
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// or, w/o global namespace pollution: |
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var Set = require('core-js/library/fn/set'); |
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var from = require('core-js/library/fn/array/from'); |
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var findIndex = require('core-js/library/fn/array/find-index'); |
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from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3] |
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findIndex([1, 2, NaN, 3, 4], isNaN); // => 2 |
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``` |
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Available entry points for methods / constructors, as above examples, and namespaces: for example, `core-js/es6/array` (`core-js/library/es6/array`) contains all [ES6 `Array` features](#ecmascript-6-array), `core-js/es6` (`core-js/library/es6`) contains all ES6 features. |
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##### Caveats when using CommonJS API: |
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* `modules` path is internal API, does not inject all required dependencies and can be changed in minor or patch releases. Use it only for a custom build and / or if you know what are you doing. |
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* `core-js` is extremely modular and uses a lot of very tiny modules, because of that for usage in browsers bundle up `core-js` instead of usage loader for each file, otherwise, you will have hundreds of requests. |
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#### CommonJS and prototype methods without global namespace pollution |
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In the `library` version, we can't pollute prototypes of native constructors. Because of that, prototype methods transformed to static methods like in examples above. `babel` `runtime` transformer also can't transform them. But with transpilers we can use one more trick - [bind operator and virtual methods](https://github.com/zenparsing/es-function-bind). Special for that, available `/virtual/` entry points. Example: |
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```js |
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import fill from 'core-js/library/fn/array/virtual/fill'; |
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import findIndex from 'core-js/library/fn/array/virtual/find-index'; |
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Array(10)::fill(0).map((a, b) => b * b)::findIndex(it => it && !(it % 8)); // => 4 |
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// or |
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import {fill, findIndex} from 'core-js/library/fn/array/virtual'; |
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Array(10)::fill(0).map((a, b) => b * b)::findIndex(it => it && !(it % 8)); // => 4 |
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``` |
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### Custom build (from the command-line) |
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``` |
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npm i core-js && cd node_modules/core-js && npm i |
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npm run grunt build:core.dict,es6 -- --blacklist=es6.promise,es6.math --library=on --path=custom uglify |
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``` |
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Where `core.dict` and `es6` are modules (namespaces) names, which will be added to the build, `es6.promise` and `es6.math` are modules (namespaces) names, which will be excluded from the build, `--library=on` is flag for build without global namespace pollution and `custom` is target file name. |
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Available namespaces: for example, `es6.array` contains [ES6 `Array` features](#ecmascript-6-array), `es6` contains all modules whose names start with `es6`. |
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### Custom build (from external scripts) |
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[`core-js-builder`](https://www.npmjs.com/package/core-js-builder) package exports a function that takes the same parameters as the `build` target from the previous section. This will conditionally include or exclude certain parts of `core-js`: |
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```js |
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require('core-js-builder')({ |
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modules: ['es6', 'core.dict'], // modules / namespaces |
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blacklist: ['es6.reflect'], // blacklist of modules / namespaces, by default - empty list |
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library: false, // flag for build without global namespace pollution, by default - false |
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umd: true // use UMD wrapper for export `core` object, by default - true |
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}).then(code => { |
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// ... |
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}).catch(error => { |
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// ... |
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}); |
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``` |
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## Supported engines |
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**Tested in:** |
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- Chrome 26+ |
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- Firefox 4+ |
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- Safari 5+ |
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- Opera 12+ |
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- Internet Explorer 6+ (sure, IE8- with ES3 limitations) |
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- Edge |
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- Android Browser 2.3+ |
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- iOS Safari 5.1+ |
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- PhantomJS 1.9 / 2.1 |
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- NodeJS 0.8+ |
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...and it doesn't mean `core-js` will not work in other engines, they just have not been tested. |
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## Features: |
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[*CommonJS entry points:*](#commonjs) |
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``` |
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core-js(/library) <- all features |
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core-js(/library)/shim <- only polyfills |
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``` |
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### ECMAScript 5 |
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All features moved to the [`es6` namespace](#ecmascript-6), here just a list of features: |
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```js |
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Object |
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.create(proto | null, descriptors?) -> object |
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.getPrototypeOf(object) -> proto | null |
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.defineProperty(target, key, desc) -> target, cap for ie8- |
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.defineProperties(target, descriptors) -> target, cap for ie8- |
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.getOwnPropertyDescriptor(object, key) -> desc |
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.getOwnPropertyNames(object) -> array |
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.keys(object) -> array |
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.seal(object) -> object, cap for ie8- |
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.freeze(object) -> object, cap for ie8- |
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.preventExtensions(object) -> object, cap for ie8- |
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.isSealed(object) -> bool, cap for ie8- |
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.isFrozen(object) -> bool, cap for ie8- |
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.isExtensible(object) -> bool, cap for ie8- |
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Array |
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.isArray(var) -> bool |
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#slice(start?, end?) -> array, fix for ie7- |
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#join(string = ',') -> string, fix for ie7- |
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#indexOf(var, from?) -> int |
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#lastIndexOf(var, from?) -> int |
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#every(fn(val, index, @), that) -> bool |
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#some(fn(val, index, @), that) -> bool |
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#forEach(fn(val, index, @), that) -> void |
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#map(fn(val, index, @), that) -> array |
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#filter(fn(val, index, @), that) -> array |
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#reduce(fn(memo, val, index, @), memo?) -> var |
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#reduceRight(fn(memo, val, index, @), memo?) -> var |
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#sort(fn?) -> @, fixes for some engines |
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Function |
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#bind(object, ...args) -> boundFn(...args) |
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String |
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#split(separator, limit) -> array |
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#trim() -> str |
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RegExp |
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#toString() -> str |
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Number |
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#toFixed(digits) -> string |
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#toPrecision(precision) -> string |
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parseInt(str, radix) -> int |
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parseFloat(str) -> num |
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Date |
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.now() -> int |
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#toISOString() -> string |
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#toJSON() -> string |
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``` |
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[*CommonJS entry points:*](#commonjs) |
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``` |
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core-js(/library)/es5 |
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``` |
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### ECMAScript 6 |
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[*CommonJS entry points:*](#commonjs) |
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``` |
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core-js(/library)/es6 |
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``` |
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#### ECMAScript 6: Object |
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Modules [`es6.object.assign`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.assign.js), [`es6.object.is`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.is.js), [`es6.object.set-prototype-of`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.set-prototype-of.js) and [`es6.object.to-string`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.to-string.js). |
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In ES6 most `Object` static methods should work with primitives. Modules [`es6.object.freeze`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.freeze.js), [`es6.object.seal`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.seal.js), [`es6.object.prevent-extensions`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.prevent-extensions.js), [`es6.object.is-frozen`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.is-frozen.js), [`es6.object.is-sealed`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.is-sealed.js), [`es6.object.is-extensible`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.is-extensible.js), [`es6.object.get-own-property-descriptor`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.get-own-property-descriptor.js), [`es6.object.get-prototype-of`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.get-prototype-of.js), [`es6.object.keys`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.keys.js) and [`es6.object.get-own-property-names`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.get-own-property-names.js). |
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Just ES5 features: [`es6.object.create`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.create.js), [`es6.object.define-property`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.define-property.js) and [`es6.object.define-properties`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.object.es6.object.define-properties.js). |
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```js |
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Object |
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.assign(target, ...src) -> target |
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.is(a, b) -> bool |
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.setPrototypeOf(target, proto | null) -> target (required __proto__ - IE11+) |
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.create(object | null, descriptors?) -> object |
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.getPrototypeOf(var) -> object | null |
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.defineProperty(object, key, desc) -> target |
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.defineProperties(object, descriptors) -> target |
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.getOwnPropertyDescriptor(var, key) -> desc | undefined |
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.keys(var) -> array |
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.getOwnPropertyNames(var) -> array |
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.freeze(var) -> var |
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.seal(var) -> var |
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.preventExtensions(var) -> var |
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.isFrozen(var) -> bool |
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.isSealed(var) -> bool |
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.isExtensible(var) -> bool |
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#toString() -> string, ES6 fix: @@toStringTag support |
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``` |
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[*CommonJS entry points:*](#commonjs) |
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``` |
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core-js(/library)/es6/object |
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core-js(/library)/fn/object/assign |
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core-js(/library)/fn/object/is |
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core-js(/library)/fn/object/set-prototype-of |
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core-js(/library)/fn/object/get-prototype-of |
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core-js(/library)/fn/object/create |
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core-js(/library)/fn/object/define-property |
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core-js(/library)/fn/object/define-properties |
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core-js(/library)/fn/object/get-own-property-descriptor |
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core-js(/library)/fn/object/keys |
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core-js(/library)/fn/object/get-own-property-names |
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core-js(/library)/fn/object/freeze |
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core-js(/library)/fn/object/seal |
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core-js(/library)/fn/object/prevent-extensions |
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core-js(/library)/fn/object/is-frozen |
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core-js(/library)/fn/object/is-sealed |
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core-js(/library)/fn/object/is-extensible |
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core-js/fn/object/to-string |
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``` |
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[*Examples*](http://goo.gl/ywdwPz): |
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```js |
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var foo = {q: 1, w: 2} |
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, bar = {e: 3, r: 4} |
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, baz = {t: 5, y: 6}; |
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Object.assign(foo, bar, baz); // => foo = {q: 1, w: 2, e: 3, r: 4, t: 5, y: 6} |
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Object.is(NaN, NaN); // => true |
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Object.is(0, -0); // => false |
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Object.is(42, 42); // => true |
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Object.is(42, '42'); // => false |
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function Parent(){} |
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function Child(){} |
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Object.setPrototypeOf(Child.prototype, Parent.prototype); |
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new Child instanceof Child; // => true |
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new Child instanceof Parent; // => true |
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var O = {}; |
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O[Symbol.toStringTag] = 'Foo'; |
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'' + O; // => '[object Foo]' |
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Object.keys('qwe'); // => ['0', '1', '2'] |
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Object.getPrototypeOf('qwe') === String.prototype; // => true |
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``` |
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#### ECMAScript 6: Function |
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Modules [`es6.function.name`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.function.name.js), [`es6.function.has-instance`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.function.has-instance.js). Just ES5: [`es6.function.bind`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.function.bind.js). |
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```js |
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Function |
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#bind(object, ...args) -> boundFn(...args) |
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#name -> string (IE9+) |
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#@@hasInstance(var) -> bool |
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``` |
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[*CommonJS entry points:*](#commonjs) |
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``` |
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core-js/es6/function |
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core-js/fn/function/name |
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core-js/fn/function/has-instance |
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core-js/fn/function/bind |
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core-js/fn/function/virtual/bind |
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``` |
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[*Example*](http://goo.gl/zqu3Wp): |
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```js |
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(function foo(){}).name // => 'foo' |
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console.log.bind(console, 42)(43); // => 42 43 |
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``` |
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#### ECMAScript 6: Array |
|
Modules [`es6.array.from`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.from.js), [`es6.array.of`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.of.js), [`es6.array.copy-within`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.copy-within.js), [`es6.array.fill`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.fill.js), [`es6.array.find`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.find.js), [`es6.array.find-index`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.find-index.js), [`es6.array.iterator`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.iterator.js). ES5 features with fixes: [`es6.array.is-array`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.is-array.js), [`es6.array.slice`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.slice.js), [`es6.array.join`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.join.js), [`es6.array.index-of`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.index-of.js), [`es6.array.last-index-of`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.last-index-of.js), [`es6.array.every`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.every.js), [`es6.array.some`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.some.js), [`es6.array.for-each`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.for-each.js), [`es6.array.map`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.map.js), [`es6.array.filter`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.filter.js), [`es6.array.reduce`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.reduce.js), [`es6.array.reduce-right`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.reduce-right.js), [`es6.array.sort`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.array.sort.js). |
|
```js |
|
Array |
|
.from(iterable | array-like, mapFn(val, index)?, that) -> array |
|
.of(...args) -> array |
|
.isArray(var) -> bool |
|
#copyWithin(target = 0, start = 0, end = @length) -> @ |
|
#fill(val, start = 0, end = @length) -> @ |
|
#find(fn(val, index, @), that) -> val |
|
#findIndex(fn(val, index, @), that) -> index | -1 |
|
#values() -> iterator |
|
#keys() -> iterator |
|
#entries() -> iterator |
|
#join(string = ',') -> string, fix for ie7- |
|
#slice(start?, end?) -> array, fix for ie7- |
|
#indexOf(var, from?) -> index | -1 |
|
#lastIndexOf(var, from?) -> index | -1 |
|
#every(fn(val, index, @), that) -> bool |
|
#some(fn(val, index, @), that) -> bool |
|
#forEach(fn(val, index, @), that) -> void |
|
#map(fn(val, index, @), that) -> array |
|
#filter(fn(val, index, @), that) -> array |
|
#reduce(fn(memo, val, index, @), memo?) -> var |
|
#reduceRight(fn(memo, val, index, @), memo?) -> var |
|
#sort(fn?) -> @, invalid arguments fix |
|
#@@iterator() -> iterator (values) |
|
#@@unscopables -> object (cap) |
|
Arguments |
|
#@@iterator() -> iterator (values, available only in core-js methods) |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js(/library)/es6/array |
|
core-js(/library)/fn/array/from |
|
core-js(/library)/fn/array/of |
|
core-js(/library)/fn/array/is-array |
|
core-js(/library)/fn/array/iterator |
|
core-js(/library)/fn/array/copy-within |
|
core-js(/library)/fn/array/fill |
|
core-js(/library)/fn/array/find |
|
core-js(/library)/fn/array/find-index |
|
core-js(/library)/fn/array/values |
|
core-js(/library)/fn/array/keys |
|
core-js(/library)/fn/array/entries |
|
core-js(/library)/fn/array/slice |
|
core-js(/library)/fn/array/join |
|
core-js(/library)/fn/array/index-of |
|
core-js(/library)/fn/array/last-index-of |
|
core-js(/library)/fn/array/every |
|
core-js(/library)/fn/array/some |
|
core-js(/library)/fn/array/for-each |
|
core-js(/library)/fn/array/map |
|
core-js(/library)/fn/array/filter |
|
core-js(/library)/fn/array/reduce |
|
core-js(/library)/fn/array/reduce-right |
|
core-js(/library)/fn/array/sort |
|
core-js(/library)/fn/array/virtual/iterator |
|
core-js(/library)/fn/array/virtual/copy-within |
|
core-js(/library)/fn/array/virtual/fill |
|
core-js(/library)/fn/array/virtual/find |
|
core-js(/library)/fn/array/virtual/find-index |
|
core-js(/library)/fn/array/virtual/values |
|
core-js(/library)/fn/array/virtual/keys |
|
core-js(/library)/fn/array/virtual/entries |
|
core-js(/library)/fn/array/virtual/slice |
|
core-js(/library)/fn/array/virtual/join |
|
core-js(/library)/fn/array/virtual/index-of |
|
core-js(/library)/fn/array/virtual/last-index-of |
|
core-js(/library)/fn/array/virtual/every |
|
core-js(/library)/fn/array/virtual/some |
|
core-js(/library)/fn/array/virtual/for-each |
|
core-js(/library)/fn/array/virtual/map |
|
core-js(/library)/fn/array/virtual/filter |
|
core-js(/library)/fn/array/virtual/reduce |
|
core-js(/library)/fn/array/virtual/reduce-right |
|
core-js(/library)/fn/array/virtual/sort |
|
``` |
|
[*Examples*](http://goo.gl/oaUFUf): |
|
```js |
|
Array.from(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3] |
|
Array.from({0: 1, 1: 2, 2: 3, length: 3}); // => [1, 2, 3] |
|
Array.from('123', Number); // => [1, 2, 3] |
|
Array.from('123', function(it){ |
|
return it * it; |
|
}); // => [1, 4, 9] |
|
|
|
Array.of(1); // => [1] |
|
Array.of(1, 2, 3); // => [1, 2, 3] |
|
|
|
var array = ['a', 'b', 'c']; |
|
|
|
for(var val of array)console.log(val); // => 'a', 'b', 'c' |
|
for(var val of array.values())console.log(val); // => 'a', 'b', 'c' |
|
for(var key of array.keys())console.log(key); // => 0, 1, 2 |
|
for(var [key, val] of array.entries()){ |
|
console.log(key); // => 0, 1, 2 |
|
console.log(val); // => 'a', 'b', 'c' |
|
} |
|
|
|
function isOdd(val){ |
|
return val % 2; |
|
} |
|
[4, 8, 15, 16, 23, 42].find(isOdd); // => 15 |
|
[4, 8, 15, 16, 23, 42].findIndex(isOdd); // => 2 |
|
[4, 8, 15, 16, 23, 42].find(isNaN); // => undefined |
|
[4, 8, 15, 16, 23, 42].findIndex(isNaN); // => -1 |
|
|
|
Array(5).fill(42); // => [42, 42, 42, 42, 42] |
|
|
|
[1, 2, 3, 4, 5].copyWithin(0, 3); // => [4, 5, 3, 4, 5] |
|
``` |
|
#### ECMAScript 6: String |
|
Modules [`es6.string.from-code-point`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.from-code-point.js), [`es6.string.raw`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.raw.js), [`es6.string.iterator`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.iterator.js), [`es6.string.code-point-at`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.code-point-at.js), [`es6.string.ends-with`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.ends-with.js), [`es6.string.includes`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.includes.js), [`es6.string.repeat`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.repeat.js), [`es6.string.starts-with`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.starts-with.js) and [`es6.string.trim`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.trim.js). |
|
|
|
Annex B HTML methods. Ugly, but it's also the part of the spec. Modules [`es6.string.anchor`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.anchor.js), [`es6.string.big`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.big.js), [`es6.string.blink`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.blink.js), [`es6.string.bold`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.bold.js), [`es6.string.fixed`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.fixed.js), [`es6.string.fontcolor`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.fontcolor.js), [`es6.string.fontsize`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.fontsize.js), [`es6.string.italics`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.italics.js), [`es6.string.link`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.link.js), [`es6.string.small`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.small.js), [`es6.string.strike`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.strike.js), [`es6.string.sub`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.sub.js) and [`es6.string.sup`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.string.sup.js). |
|
```js |
|
String |
|
.fromCodePoint(...codePoints) -> str |
|
.raw({raw}, ...substitutions) -> str |
|
#includes(str, from?) -> bool |
|
#startsWith(str, from?) -> bool |
|
#endsWith(str, from?) -> bool |
|
#repeat(num) -> str |
|
#codePointAt(pos) -> uint |
|
#trim() -> str, ES6 fix |
|
#anchor(name) -> str |
|
#big() -> str |
|
#blink() -> str |
|
#bold() -> str |
|
#fixed() -> str |
|
#fontcolor(color) -> str |
|
#fontsize(size) -> str |
|
#italics() -> str |
|
#link(url) -> str |
|
#small() -> str |
|
#strike() -> str |
|
#sub() -> str |
|
#sup() -> str |
|
#@@iterator() -> iterator (code points) |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js(/library)/es6/string |
|
core-js(/library)/fn/string/from-code-point |
|
core-js(/library)/fn/string/raw |
|
core-js(/library)/fn/string/includes |
|
core-js(/library)/fn/string/starts-with |
|
core-js(/library)/fn/string/ends-with |
|
core-js(/library)/fn/string/repeat |
|
core-js(/library)/fn/string/code-point-at |
|
core-js(/library)/fn/string/trim |
|
core-js(/library)/fn/string/anchor |
|
core-js(/library)/fn/string/big |
|
core-js(/library)/fn/string/blink |
|
core-js(/library)/fn/string/bold |
|
core-js(/library)/fn/string/fixed |
|
core-js(/library)/fn/string/fontcolor |
|
core-js(/library)/fn/string/fontsize |
|
core-js(/library)/fn/string/italics |
|
core-js(/library)/fn/string/link |
|
core-js(/library)/fn/string/small |
|
core-js(/library)/fn/string/strike |
|
core-js(/library)/fn/string/sub |
|
core-js(/library)/fn/string/sup |
|
core-js(/library)/fn/string/iterator |
|
core-js(/library)/fn/string/virtual/includes |
|
core-js(/library)/fn/string/virtual/starts-with |
|
core-js(/library)/fn/string/virtual/ends-with |
|
core-js(/library)/fn/string/virtual/repeat |
|
core-js(/library)/fn/string/virtual/code-point-at |
|
core-js(/library)/fn/string/virtual/trim |
|
core-js(/library)/fn/string/virtual/anchor |
|
core-js(/library)/fn/string/virtual/big |
|
core-js(/library)/fn/string/virtual/blink |
|
core-js(/library)/fn/string/virtual/bold |
|
core-js(/library)/fn/string/virtual/fixed |
|
core-js(/library)/fn/string/virtual/fontcolor |
|
core-js(/library)/fn/string/virtual/fontsize |
|
core-js(/library)/fn/string/virtual/italics |
|
core-js(/library)/fn/string/virtual/link |
|
core-js(/library)/fn/string/virtual/small |
|
core-js(/library)/fn/string/virtual/strike |
|
core-js(/library)/fn/string/virtual/sub |
|
core-js(/library)/fn/string/virtual/sup |
|
core-js(/library)/fn/string/virtual/iterator |
|
``` |
|
[*Examples*](http://goo.gl/3UaQ93): |
|
```js |
|
for(var val of 'a𠮷b'){ |
|
console.log(val); // => 'a', '𠮷', 'b' |
|
} |
|
|
|
'foobarbaz'.includes('bar'); // => true |
|
'foobarbaz'.includes('bar', 4); // => false |
|
'foobarbaz'.startsWith('foo'); // => true |
|
'foobarbaz'.startsWith('bar', 3); // => true |
|
'foobarbaz'.endsWith('baz'); // => true |
|
'foobarbaz'.endsWith('bar', 6); // => true |
|
|
|
'string'.repeat(3); // => 'stringstringstring' |
|
|
|
'𠮷'.codePointAt(0); // => 134071 |
|
String.fromCodePoint(97, 134071, 98); // => 'a𠮷b' |
|
|
|
var name = 'Bob'; |
|
String.raw`Hi\n${name}!`; // => 'Hi\\nBob!' (ES6 template string syntax) |
|
String.raw({raw: 'test'}, 0, 1, 2); // => 't0e1s2t' |
|
|
|
'foo'.bold(); // => '<b>foo</b>' |
|
'bar'.anchor('a"b'); // => '<a name="a"b">bar</a>' |
|
'baz'.link('http://example.com'); // => '<a href="http://example.com">baz</a>' |
|
``` |
|
#### ECMAScript 6: RegExp |
|
Modules [`es6.regexp.constructor`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.regexp.constructor.js) and [`es6.regexp.flags`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.regexp.flags.js). |
|
|
|
Support well-known [symbols](#ecmascript-6-symbol) `@@match`, `@@replace`, `@@search` and `@@split`, modules [`es6.regexp.match`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.regexp.match.js), [`es6.regexp.replace`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.regexp.replace.js), [`es6.regexp.search`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.regexp.search.js) and [`es6.regexp.split`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.regexp.split.js). |
|
``` |
|
[new] RegExp(pattern, flags?) -> regexp, ES6 fix: can alter flags (IE9+) |
|
#flags -> str (IE9+) |
|
#toString() -> str, ES6 fixes |
|
#@@match(str) -> array | null |
|
#@@replace(str, replacer) -> string |
|
#@@search(str) -> index |
|
#@@split(str, limit) -> array |
|
String |
|
#match(tpl) -> var, ES6 fix for support @@match |
|
#replace(tpl, replacer) -> var, ES6 fix for support @@replace |
|
#search(tpl) -> var, ES6 fix for support @@search |
|
#split(tpl, limit) -> var, ES6 fix for support @@split, some fixes for old engines |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js/es6/regexp |
|
core-js/fn/regexp/constructor |
|
core-js(/library)/fn/regexp/flags |
|
core-js/fn/regexp/to-string |
|
core-js/fn/regexp/match |
|
core-js/fn/regexp/replace |
|
core-js/fn/regexp/search |
|
core-js/fn/regexp/split |
|
``` |
|
[*Examples*](http://goo.gl/PiJxBD): |
|
```js |
|
RegExp(/./g, 'm'); // => /./m |
|
|
|
/foo/.flags; // => '' |
|
/foo/gim.flags; // => 'gim' |
|
|
|
'foo'.match({[Symbol.match]: _ => 1}); // => 1 |
|
'foo'.replace({[Symbol.replace]: _ => 2}); // => 2 |
|
'foo'.search({[Symbol.search]: _ => 3}); // => 3 |
|
'foo'.split({[Symbol.split]: _ => 4}); // => 4 |
|
|
|
RegExp.prototype.toString.call({source: 'foo', flags: 'bar'}); // => '/foo/bar' |
|
``` |
|
#### ECMAScript 6: Number |
|
Module [`es6.number.constructor`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.number.constructor.js). `Number` constructor support binary and octal literals, [*example*](http://goo.gl/jRd6b3): |
|
```js |
|
Number('0b1010101'); // => 85 |
|
Number('0o7654321'); // => 2054353 |
|
``` |
|
Modules [`es6.number.epsilon`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.number.epsilon.js), [`es6.number.is-finite`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.number.is-finite.js), [`es6.number.is-integer`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.number.is-integer.js), [`es6.number.is-nan`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.number.is-nan.js), [`es6.number.is-safe-integer`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.number.is-safe-integer.js), [`es6.number.max-safe-integer`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.number.max-safe-integer.js), [`es6.number.min-safe-integer`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.number.min-safe-integer.js), [`es6.number.parse-float`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.number.parse-float.js), [`es6.number.parse-int`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.number.parse-int.js), [`es6.number.to-fixed`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.number.to-fixed.js), [`es6.number.to-precision`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.number.to-precision.js), [`es6.parse-int`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.parse-int.js), [`es6.parse-float`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.parse-float.js). |
|
```js |
|
[new] Number(var) -> number | number object |
|
.isFinite(num) -> bool |
|
.isNaN(num) -> bool |
|
.isInteger(num) -> bool |
|
.isSafeInteger(num) -> bool |
|
.parseFloat(str) -> num |
|
.parseInt(str) -> int |
|
.EPSILON -> num |
|
.MAX_SAFE_INTEGER -> int |
|
.MIN_SAFE_INTEGER -> int |
|
#toFixed(digits) -> string, fixes |
|
#toPrecision(precision) -> string, fixes |
|
parseFloat(str) -> num, fixes |
|
parseInt(str) -> int, fixes |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js(/library)/es6/number |
|
core-js/es6/number/constructor |
|
core-js(/library)/fn/number/is-finite |
|
core-js(/library)/fn/number/is-nan |
|
core-js(/library)/fn/number/is-integer |
|
core-js(/library)/fn/number/is-safe-integer |
|
core-js(/library)/fn/number/parse-float |
|
core-js(/library)/fn/number/parse-int |
|
core-js(/library)/fn/number/epsilon |
|
core-js(/library)/fn/number/max-safe-integer |
|
core-js(/library)/fn/number/min-safe-integer |
|
core-js(/library)/fn/number/to-fixed |
|
core-js(/library)/fn/number/to-precision |
|
core-js(/library)/fn/parse-float |
|
core-js(/library)/fn/parse-int |
|
``` |
|
#### ECMAScript 6: Math |
|
Modules [`es6.math.acosh`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.acosh.js), [`es6.math.asinh`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.asinh.js), [`es6.math.atanh`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.atanh.js), [`es6.math.cbrt`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.cbrt.js), [`es6.math.clz32`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.clz32.js), [`es6.math.cosh`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.cosh.js), [`es6.math.expm1`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.expm1.js), [`es6.math.fround`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.fround.js), [`es6.math.hypot`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.hypot.js), [`es6.math.imul`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.imul.js), [`es6.math.log10`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.log10.js), [`es6.math.log1p`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.log1p.js), [`es6.math.log2`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.log2.js), [`es6.math.sign`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.sign.js), [`es6.math.sinh`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.sinh.js), [`es6.math.tanh`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.tanh.js), [`es6.math.trunc`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.math.trunc.js). |
|
```js |
|
Math |
|
.acosh(num) -> num |
|
.asinh(num) -> num |
|
.atanh(num) -> num |
|
.cbrt(num) -> num |
|
.clz32(num) -> uint |
|
.cosh(num) -> num |
|
.expm1(num) -> num |
|
.fround(num) -> num |
|
.hypot(...args) -> num |
|
.imul(num, num) -> int |
|
.log1p(num) -> num |
|
.log10(num) -> num |
|
.log2(num) -> num |
|
.sign(num) -> 1 | -1 | 0 | -0 | NaN |
|
.sinh(num) -> num |
|
.tanh(num) -> num |
|
.trunc(num) -> num |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js(/library)/es6/math |
|
core-js(/library)/fn/math/acosh |
|
core-js(/library)/fn/math/asinh |
|
core-js(/library)/fn/math/atanh |
|
core-js(/library)/fn/math/cbrt |
|
core-js(/library)/fn/math/clz32 |
|
core-js(/library)/fn/math/cosh |
|
core-js(/library)/fn/math/expm1 |
|
core-js(/library)/fn/math/fround |
|
core-js(/library)/fn/math/hypot |
|
core-js(/library)/fn/math/imul |
|
core-js(/library)/fn/math/log1p |
|
core-js(/library)/fn/math/log10 |
|
core-js(/library)/fn/math/log2 |
|
core-js(/library)/fn/math/sign |
|
core-js(/library)/fn/math/sinh |
|
core-js(/library)/fn/math/tanh |
|
core-js(/library)/fn/math/trunc |
|
``` |
|
#### ECMAScript 6: Date |
|
Modules [`es6.date.to-string`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.date.to-string.js), ES5 features with fixes: [`es6.date.now`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.date.now.js), [`es6.date.to-iso-string`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.date.to-iso-string.js), [`es6.date.to-json`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.date.to-json.js) and [`es6.date.to-primitive`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.date.to-primitive.js). |
|
```js |
|
Date |
|
.now() -> int |
|
#toISOString() -> string |
|
#toJSON() -> string |
|
#toString() -> string |
|
#@@toPrimitive(hint) -> primitive |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js/es6/date |
|
core-js/fn/date/to-string |
|
core-js(/library)/fn/date/now |
|
core-js(/library)/fn/date/to-iso-string |
|
core-js(/library)/fn/date/to-json |
|
core-js(/library)/fn/date/to-primitive |
|
``` |
|
[*Example*](http://goo.gl/haeHLR): |
|
```js |
|
new Date(NaN).toString(); // => 'Invalid Date' |
|
``` |
|
|
|
#### ECMAScript 6: Promise |
|
Module [`es6.promise`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.promise.js). |
|
```js |
|
new Promise(executor(resolve(var), reject(var))) -> promise |
|
#then(resolved(var), rejected(var)) -> promise |
|
#catch(rejected(var)) -> promise |
|
.resolve(promise | var) -> promise |
|
.reject(var) -> promise |
|
.all(iterable) -> promise |
|
.race(iterable) -> promise |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js(/library)/es6/promise |
|
core-js(/library)/fn/promise |
|
``` |
|
Basic [*example*](http://goo.gl/vGrtUC): |
|
```js |
|
function sleepRandom(time){ |
|
return new Promise(function(resolve, reject){ |
|
setTimeout(resolve, time * 1e3, 0 | Math.random() * 1e3); |
|
}); |
|
} |
|
|
|
console.log('Run'); // => Run |
|
sleepRandom(5).then(function(result){ |
|
console.log(result); // => 869, after 5 sec. |
|
return sleepRandom(10); |
|
}).then(function(result){ |
|
console.log(result); // => 202, after 10 sec. |
|
}).then(function(){ |
|
console.log('immediately after'); // => immediately after |
|
throw Error('Irror!'); |
|
}).then(function(){ |
|
console.log('will not be displayed'); |
|
}).catch(x => console.log(x)); // => => Error: Irror! |
|
``` |
|
`Promise.resolve` and `Promise.reject` [*example*](http://goo.gl/vr8TN3): |
|
```js |
|
Promise.resolve(42).then(x => console.log(x)); // => 42 |
|
Promise.reject(42).catch(x => console.log(x)); // => 42 |
|
|
|
Promise.resolve($.getJSON('/data.json')); // => ES6 promise |
|
``` |
|
`Promise.all` [*example*](http://goo.gl/RdoDBZ): |
|
```js |
|
Promise.all([ |
|
'foo', |
|
sleepRandom(5), |
|
sleepRandom(15), |
|
sleepRandom(10) // after 15 sec: |
|
]).then(x => console.log(x)); // => ['foo', 956, 85, 382] |
|
``` |
|
`Promise.race` [*example*](http://goo.gl/L8ovkJ): |
|
```js |
|
function timeLimit(promise, time){ |
|
return Promise.race([promise, new Promise(function(resolve, reject){ |
|
setTimeout(reject, time * 1e3, Error('Await > ' + time + ' sec')); |
|
})]); |
|
} |
|
|
|
timeLimit(sleepRandom(5), 10).then(x => console.log(x)); // => 853, after 5 sec. |
|
timeLimit(sleepRandom(15), 10).catch(x => console.log(x)); // Error: Await > 10 sec |
|
``` |
|
ECMAScript 7 [async functions](https://tc39.github.io/ecmascript-asyncawait) [example](http://goo.gl/wnQS4j): |
|
```js |
|
var delay = time => new Promise(resolve => setTimeout(resolve, time)) |
|
|
|
async function sleepRandom(time){ |
|
await delay(time * 1e3); |
|
return 0 | Math.random() * 1e3; |
|
}; |
|
async function sleepError(time, msg){ |
|
await delay(time * 1e3); |
|
throw Error(msg); |
|
}; |
|
|
|
(async () => { |
|
try { |
|
console.log('Run'); // => Run |
|
console.log(await sleepRandom(5)); // => 936, after 5 sec. |
|
var [a, b, c] = await Promise.all([ |
|
sleepRandom(5), |
|
sleepRandom(15), |
|
sleepRandom(10) |
|
]); |
|
console.log(a, b, c); // => 210 445 71, after 15 sec. |
|
await sleepError(5, 'Irror!'); |
|
console.log('Will not be displayed'); |
|
} catch(e){ |
|
console.log(e); // => Error: 'Irror!', after 5 sec. |
|
} |
|
})(); |
|
``` |
|
|
|
##### Unhandled rejection tracking |
|
|
|
In Node.js, like in native implementation, available events [`unhandledRejection`](https://nodejs.org/api/process.html#process_event_unhandledrejection) and [`rejectionHandled`](https://nodejs.org/api/process.html#process_event_rejectionhandled): |
|
```js |
|
process.on('unhandledRejection', (reason, promise) => console.log('unhandled', reason, promise)); |
|
process.on('rejectionHandled', (promise) => console.log('handled', promise)); |
|
|
|
var p = Promise.reject(42); |
|
// unhandled 42 [object Promise] |
|
|
|
setTimeout(() => p.catch(_ => _), 1e3); |
|
// handled [object Promise] |
|
``` |
|
In a browser on rejection, by default, you will see notify in the console, or you can add a custom handler and a handler on handling unhandled, [*example*](http://goo.gl/Wozskl): |
|
```js |
|
window.onunhandledrejection = e => console.log('unhandled', e.reason, e.promise); |
|
window.onrejectionhandled = e => console.log('handled', e.reason, e.promise); |
|
|
|
var p = Promise.reject(42); |
|
// unhandled 42 [object Promise] |
|
|
|
setTimeout(() => p.catch(_ => _), 1e3); |
|
// handled 42 [object Promise] |
|
``` |
|
|
|
#### ECMAScript 6: Symbol |
|
Module [`es6.symbol`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.symbol.js). |
|
```js |
|
Symbol(description?) -> symbol |
|
.hasInstance -> @@hasInstance |
|
.isConcatSpreadable -> @@isConcatSpreadable |
|
.iterator -> @@iterator |
|
.match -> @@match |
|
.replace -> @@replace |
|
.search -> @@search |
|
.species -> @@species |
|
.split -> @@split |
|
.toPrimitive -> @@toPrimitive |
|
.toStringTag -> @@toStringTag |
|
.unscopables -> @@unscopables |
|
.for(key) -> symbol |
|
.keyFor(symbol) -> key |
|
.useSimple() -> void |
|
.useSetter() -> void |
|
Object |
|
.getOwnPropertySymbols(object) -> array |
|
``` |
|
Also wrapped some methods for correct work with `Symbol` polyfill. |
|
```js |
|
Object |
|
.create(proto | null, descriptors?) -> object |
|
.defineProperty(target, key, desc) -> target |
|
.defineProperties(target, descriptors) -> target |
|
.getOwnPropertyDescriptor(var, key) -> desc | undefined |
|
.getOwnPropertyNames(var) -> array |
|
#propertyIsEnumerable(key) -> bool |
|
JSON |
|
.stringify(target, replacer?, space?) -> string | undefined |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js(/library)/es6/symbol |
|
core-js(/library)/fn/symbol |
|
core-js(/library)/fn/symbol/has-instance |
|
core-js(/library)/fn/symbol/is-concat-spreadable |
|
core-js(/library)/fn/symbol/iterator |
|
core-js(/library)/fn/symbol/match |
|
core-js(/library)/fn/symbol/replace |
|
core-js(/library)/fn/symbol/search |
|
core-js(/library)/fn/symbol/species |
|
core-js(/library)/fn/symbol/split |
|
core-js(/library)/fn/symbol/to-primitive |
|
core-js(/library)/fn/symbol/to-string-tag |
|
core-js(/library)/fn/symbol/unscopables |
|
core-js(/library)/fn/symbol/for |
|
core-js(/library)/fn/symbol/key-for |
|
``` |
|
[*Basic example*](http://goo.gl/BbvWFc): |
|
```js |
|
var Person = (function(){ |
|
var NAME = Symbol('name'); |
|
function Person(name){ |
|
this[NAME] = name; |
|
} |
|
Person.prototype.getName = function(){ |
|
return this[NAME]; |
|
}; |
|
return Person; |
|
})(); |
|
|
|
var person = new Person('Vasya'); |
|
console.log(person.getName()); // => 'Vasya' |
|
console.log(person['name']); // => undefined |
|
console.log(person[Symbol('name')]); // => undefined, symbols are uniq |
|
for(var key in person)console.log(key); // => only 'getName', symbols are not enumerable |
|
``` |
|
`Symbol.for` & `Symbol.keyFor` [*example*](http://goo.gl/0pdJjX): |
|
```js |
|
var symbol = Symbol.for('key'); |
|
symbol === Symbol.for('key'); // true |
|
Symbol.keyFor(symbol); // 'key' |
|
``` |
|
[*Example*](http://goo.gl/mKVOQJ) with methods for getting own object keys: |
|
```js |
|
var O = {a: 1}; |
|
Object.defineProperty(O, 'b', {value: 2}); |
|
O[Symbol('c')] = 3; |
|
Object.keys(O); // => ['a'] |
|
Object.getOwnPropertyNames(O); // => ['a', 'b'] |
|
Object.getOwnPropertySymbols(O); // => [Symbol(c)] |
|
Reflect.ownKeys(O); // => ['a', 'b', Symbol(c)] |
|
``` |
|
##### Caveats when using `Symbol` polyfill: |
|
|
|
* We can't add new primitive type, `Symbol` returns object. |
|
* `Symbol.for` and `Symbol.keyFor` can't be shimmed cross-realm. |
|
* By default, to hide the keys, `Symbol` polyfill defines setter in `Object.prototype`. For this reason, uncontrolled creation of symbols can cause memory leak and the `in` operator is not working correctly with `Symbol` polyfill: `Symbol() in {} // => true`. |
|
|
|
You can disable defining setters in `Object.prototype`. [Example](http://goo.gl/N5UD7J): |
|
```js |
|
Symbol.useSimple(); |
|
var s1 = Symbol('s1') |
|
, o1 = {}; |
|
o1[s1] = true; |
|
for(var key in o1)console.log(key); // => 'Symbol(s1)_t.qamkg9f3q', w/o native Symbol |
|
|
|
Symbol.useSetter(); |
|
var s2 = Symbol('s2') |
|
, o2 = {}; |
|
o2[s2] = true; |
|
for(var key in o2)console.log(key); // nothing |
|
``` |
|
* Currently, `core-js` not adds setters to `Object.prototype` for well-known symbols for correct work something like `Symbol.iterator in foo`. It can cause problems with their enumerability. |
|
* Some problems possible with environment exotic objects (for example, IE `localStorage`). |
|
|
|
#### ECMAScript 6: Collections |
|
`core-js` uses native collections in most case, just fixes methods / constructor, if it's required, and in old environment uses fast polyfill (O(1) lookup). |
|
#### Map |
|
Module [`es6.map`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.map.js). |
|
```js |
|
new Map(iterable (entries) ?) -> map |
|
#clear() -> void |
|
#delete(key) -> bool |
|
#forEach(fn(val, key, @), that) -> void |
|
#get(key) -> val |
|
#has(key) -> bool |
|
#set(key, val) -> @ |
|
#size -> uint |
|
#values() -> iterator |
|
#keys() -> iterator |
|
#entries() -> iterator |
|
#@@iterator() -> iterator (entries) |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js(/library)/es6/map |
|
core-js(/library)/fn/map |
|
``` |
|
[*Examples*](http://goo.gl/GWR7NI): |
|
```js |
|
var a = [1]; |
|
|
|
var map = new Map([['a', 1], [42, 2]]); |
|
map.set(a, 3).set(true, 4); |
|
|
|
console.log(map.size); // => 4 |
|
console.log(map.has(a)); // => true |
|
console.log(map.has([1])); // => false |
|
console.log(map.get(a)); // => 3 |
|
map.forEach(function(val, key){ |
|
console.log(val); // => 1, 2, 3, 4 |
|
console.log(key); // => 'a', 42, [1], true |
|
}); |
|
map.delete(a); |
|
console.log(map.size); // => 3 |
|
console.log(map.get(a)); // => undefined |
|
console.log(Array.from(map)); // => [['a', 1], [42, 2], [true, 4]] |
|
|
|
var map = new Map([['a', 1], ['b', 2], ['c', 3]]); |
|
|
|
for(var [key, val] of map){ |
|
console.log(key); // => 'a', 'b', 'c' |
|
console.log(val); // => 1, 2, 3 |
|
} |
|
for(var val of map.values())console.log(val); // => 1, 2, 3 |
|
for(var key of map.keys())console.log(key); // => 'a', 'b', 'c' |
|
for(var [key, val] of map.entries()){ |
|
console.log(key); // => 'a', 'b', 'c' |
|
console.log(val); // => 1, 2, 3 |
|
} |
|
``` |
|
#### Set |
|
Module [`es6.set`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.set.js). |
|
```js |
|
new Set(iterable?) -> set |
|
#add(key) -> @ |
|
#clear() -> void |
|
#delete(key) -> bool |
|
#forEach(fn(el, el, @), that) -> void |
|
#has(key) -> bool |
|
#size -> uint |
|
#values() -> iterator |
|
#keys() -> iterator |
|
#entries() -> iterator |
|
#@@iterator() -> iterator (values) |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js(/library)/es6/set |
|
core-js(/library)/fn/set |
|
``` |
|
[*Examples*](http://goo.gl/bmhLwg): |
|
```js |
|
var set = new Set(['a', 'b', 'a', 'c']); |
|
set.add('d').add('b').add('e'); |
|
console.log(set.size); // => 5 |
|
console.log(set.has('b')); // => true |
|
set.forEach(function(it){ |
|
console.log(it); // => 'a', 'b', 'c', 'd', 'e' |
|
}); |
|
set.delete('b'); |
|
console.log(set.size); // => 4 |
|
console.log(set.has('b')); // => false |
|
console.log(Array.from(set)); // => ['a', 'c', 'd', 'e'] |
|
|
|
var set = new Set([1, 2, 3, 2, 1]); |
|
|
|
for(var val of set)console.log(val); // => 1, 2, 3 |
|
for(var val of set.values())console.log(val); // => 1, 2, 3 |
|
for(var key of set.keys())console.log(key); // => 1, 2, 3 |
|
for(var [key, val] of set.entries()){ |
|
console.log(key); // => 1, 2, 3 |
|
console.log(val); // => 1, 2, 3 |
|
} |
|
``` |
|
#### WeakMap |
|
Module [`es6.weak-map`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.weak-map.js). |
|
```js |
|
new WeakMap(iterable (entries) ?) -> weakmap |
|
#delete(key) -> bool |
|
#get(key) -> val |
|
#has(key) -> bool |
|
#set(key, val) -> @ |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js(/library)/es6/weak-map |
|
core-js(/library)/fn/weak-map |
|
``` |
|
[*Examples*](http://goo.gl/SILXyw): |
|
```js |
|
var a = [1] |
|
, b = [2] |
|
, c = [3]; |
|
|
|
var wmap = new WeakMap([[a, 1], [b, 2]]); |
|
wmap.set(c, 3).set(b, 4); |
|
console.log(wmap.has(a)); // => true |
|
console.log(wmap.has([1])); // => false |
|
console.log(wmap.get(a)); // => 1 |
|
wmap.delete(a); |
|
console.log(wmap.get(a)); // => undefined |
|
|
|
// Private properties store: |
|
var Person = (function(){ |
|
var names = new WeakMap; |
|
function Person(name){ |
|
names.set(this, name); |
|
} |
|
Person.prototype.getName = function(){ |
|
return names.get(this); |
|
}; |
|
return Person; |
|
})(); |
|
|
|
var person = new Person('Vasya'); |
|
console.log(person.getName()); // => 'Vasya' |
|
for(var key in person)console.log(key); // => only 'getName' |
|
``` |
|
#### WeakSet |
|
Module [`es6.weak-set`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.weak-set.js). |
|
```js |
|
new WeakSet(iterable?) -> weakset |
|
#add(key) -> @ |
|
#delete(key) -> bool |
|
#has(key) -> bool |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js(/library)/es6/weak-set |
|
core-js(/library)/fn/weak-set |
|
``` |
|
[*Examples*](http://goo.gl/TdFbEx): |
|
```js |
|
var a = [1] |
|
, b = [2] |
|
, c = [3]; |
|
|
|
var wset = new WeakSet([a, b, a]); |
|
wset.add(c).add(b).add(c); |
|
console.log(wset.has(b)); // => true |
|
console.log(wset.has([2])); // => false |
|
wset.delete(b); |
|
console.log(wset.has(b)); // => false |
|
``` |
|
##### Caveats when using collections polyfill: |
|
|
|
* Weak-collections polyfill stores values as hidden properties of keys. It works correct and not leak in most cases. However, it is desirable to store a collection longer than its keys. |
|
|
|
#### ECMAScript 6: Typed Arrays |
|
Implementations and fixes `ArrayBuffer`, `DataView`, typed arrays constructors, static and prototype methods. Typed Arrays work only in environments with support descriptors (IE9+), `ArrayBuffer` and `DataView` should work anywhere. |
|
|
|
Modules [`es6.typed.array-buffer`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.typed.array-buffer.js), [`es6.typed.data-view`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.typed.data-view.js), [`es6.typed.int8-array`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.typed.int8-array.js), [`es6.typed.uint8-array`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.typed.uint8-array.js), [`es6.typed.uint8-clamped-array`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.typed.uint8-clamped-array.js), [`es6.typed.int16-array`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.typed.int16-array.js), [`es6.typed.uint16-array`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.typed.uint16-array.js), [`es6.typed.int32-array`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.typed.int32-array.js), [`es6.typed.uint32-array`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.typed.uint32-array.js), [`es6.typed.float32-array`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.typed.float32-array.js) and [`es6.typed.float64-array`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.typed.float64-array.js). |
|
```js |
|
new ArrayBuffer(length) -> buffer |
|
.isView(var) -> bool |
|
#slice(start = 0, end = @length) -> buffer |
|
#byteLength -> uint |
|
|
|
new DataView(buffer, byteOffset = 0, byteLength = buffer.byteLength - byteOffset) -> view |
|
#getInt8(offset) -> int8 |
|
#getUint8(offset) -> uint8 |
|
#getInt16(offset, littleEndian = false) -> int16 |
|
#getUint16(offset, littleEndian = false) -> uint16 |
|
#getInt32(offset, littleEndian = false) -> int32 |
|
#getUint32(offset, littleEndian = false) -> uint32 |
|
#getFloat32(offset, littleEndian = false) -> float32 |
|
#getFloat64(offset, littleEndian = false) -> float64 |
|
#setInt8(offset, value) -> void |
|
#setUint8(offset, value) -> void |
|
#setInt16(offset, value, littleEndian = false) -> void |
|
#setUint16(offset, value, littleEndian = false) -> void |
|
#setInt32(offset, value, littleEndian = false) -> void |
|
#setUint32(offset, value, littleEndian = false) -> void |
|
#setFloat32(offset, value, littleEndian = false) -> void |
|
#setFloat64(offset, value, littleEndian = false) -> void |
|
#buffer -> buffer |
|
#byteLength -> uint |
|
#byteOffset -> uint |
|
|
|
{ |
|
Int8Array, |
|
Uint8Array, |
|
Uint8ClampedArray, |
|
Int16Array, |
|
Uint16Array, |
|
Int32Array, |
|
Uint32Array, |
|
Float32Array, |
|
Float64Array |
|
} |
|
new %TypedArray%(length) -> typed |
|
new %TypedArray%(typed) -> typed |
|
new %TypedArray%(arrayLike) -> typed |
|
new %TypedArray%(iterable) -> typed |
|
new %TypedArray%(buffer, byteOffset = 0, length = (buffer.byteLength - byteOffset) / @BYTES_PER_ELEMENT) -> typed |
|
.BYTES_PER_ELEMENT -> uint |
|
.from(arrayLike | iterable, mapFn(val, index)?, that) -> typed |
|
.of(...args) -> typed |
|
#BYTES_PER_ELEMENT -> uint |
|
#copyWithin(target = 0, start = 0, end = @length) -> @ |
|
#every(fn(val, index, @), that) -> bool |
|
#fill(val, start = 0, end = @length) -> @ |
|
#filter(fn(val, index, @), that) -> typed |
|
#find(fn(val, index, @), that) -> val |
|
#findIndex(fn(val, index, @), that) -> index |
|
#forEach(fn(val, index, @), that) -> void |
|
#indexOf(var, from?) -> int |
|
#join(string = ',') -> string |
|
#lastIndexOf(var, from?) -> int |
|
#map(fn(val, index, @), that) -> typed |
|
#reduce(fn(memo, val, index, @), memo?) -> var |
|
#reduceRight(fn(memo, val, index, @), memo?) -> var |
|
#reverse() -> @ |
|
#set(arrayLike, offset = 0) -> void |
|
#slice(start = 0, end = @length) -> typed |
|
#some(fn(val, index, @), that) -> bool |
|
#sort(fn(a, b)?) -> @ |
|
#subarray(start = 0, end = @length) -> typed |
|
#toString() -> string |
|
#toLocaleString() -> string |
|
#values() -> iterator |
|
#keys() -> iterator |
|
#entries() -> iterator |
|
#@@iterator() -> iterator (values) |
|
#buffer -> buffer |
|
#byteLength -> uint |
|
#byteOffset -> uint |
|
#length -> uint |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js(/library)/es6/typed |
|
core-js(/library)/fn/typed |
|
core-js(/library)/fn/typed/array-buffer |
|
core-js(/library)/fn/typed/data-view |
|
core-js(/library)/fn/typed/int8-array |
|
core-js(/library)/fn/typed/uint8-array |
|
core-js(/library)/fn/typed/uint8-clamped-array |
|
core-js(/library)/fn/typed/int16-array |
|
core-js(/library)/fn/typed/uint16-array |
|
core-js(/library)/fn/typed/int32-array |
|
core-js(/library)/fn/typed/uint32-array |
|
core-js(/library)/fn/typed/float32-array |
|
core-js(/library)/fn/typed/float64-array |
|
``` |
|
[*Examples*](http://goo.gl/yla75z): |
|
```js |
|
new Int32Array(4); // => [0, 0, 0, 0] |
|
new Uint8ClampedArray([1, 2, 3, 666]); // => [1, 2, 3, 255] |
|
new Float32Array(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3] |
|
|
|
var buffer = new ArrayBuffer(8); |
|
var view = new DataView(buffer); |
|
view.setFloat64(0, 123.456, true); |
|
new Uint8Array(buffer.slice(4)); // => [47, 221, 94, 64] |
|
|
|
Int8Array.of(1, 1.5, 5.7, 745); // => [1, 1, 5, -23] |
|
Uint8Array.from([1, 1.5, 5.7, 745]); // => [1, 1, 5, 233] |
|
|
|
var typed = new Uint8Array([1, 2, 3]); |
|
|
|
var a = typed.slice(1); // => [2, 3] |
|
typed.buffer === a.buffer; // => false |
|
var b = typed.subarray(1); // => [2, 3] |
|
typed.buffer === b.buffer; // => true |
|
|
|
typed.filter(it => it % 2); // => [1, 3] |
|
typed.map(it => it * 1.5); // => [1, 3, 4] |
|
|
|
for(var val of typed)console.log(val); // => 1, 2, 3 |
|
for(var val of typed.values())console.log(val); // => 1, 2, 3 |
|
for(var key of typed.keys())console.log(key); // => 0, 1, 2 |
|
for(var [key, val] of typed.entries()){ |
|
console.log(key); // => 0, 1, 2 |
|
console.log(val); // => 1, 2, 3 |
|
} |
|
``` |
|
##### Caveats when using typed arrays: |
|
|
|
* Typed Arrays polyfills works completely how should work by the spec, but because of internal use getter / setters on each instance, is slow and consumes significant memory. However, typed arrays polyfills required mainly for IE9 (and for `Uint8ClampedArray` in IE10 and early IE11), all modern engines have native typed arrays and requires only constructors fixes and methods. |
|
* The current version hasn't special entry points for methods, they can be added only with constructors. It can be added in the future. |
|
* In the `library` version we can't pollute native prototypes, so prototype methods available as constructors static. |
|
|
|
#### ECMAScript 6: Reflect |
|
Modules [`es6.reflect.apply`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.apply.js), [`es6.reflect.construct`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.construct.js), [`es6.reflect.define-property`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.define-property.js), [`es6.reflect.delete-property`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.delete-property.js), [`es6.reflect.enumerate`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.enumerate.js), [`es6.reflect.get`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.get.js), [`es6.reflect.get-own-property-descriptor`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.get-own-property-descriptor.js), [`es6.reflect.get-prototype-of`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.get-prototype-of.js), [`es6.reflect.has`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.has.js), [`es6.reflect.is-extensible`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.is-extensible.js), [`es6.reflect.own-keys`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.own-keys.js), [`es6.reflect.prevent-extensions`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.prevent-extensions.js), [`es6.reflect.set`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.set.js), [`es6.reflect.set-prototype-of`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es6.reflect.set-prototype-of.js). |
|
```js |
|
Reflect |
|
.apply(target, thisArgument, argumentsList) -> var |
|
.construct(target, argumentsList, newTarget?) -> object |
|
.defineProperty(target, propertyKey, attributes) -> bool |
|
.deleteProperty(target, propertyKey) -> bool |
|
.enumerate(target) -> iterator (removed from the spec and will be removed from core-js@3) |
|
.get(target, propertyKey, receiver?) -> var |
|
.getOwnPropertyDescriptor(target, propertyKey) -> desc |
|
.getPrototypeOf(target) -> object | null |
|
.has(target, propertyKey) -> bool |
|
.isExtensible(target) -> bool |
|
.ownKeys(target) -> array |
|
.preventExtensions(target) -> bool |
|
.set(target, propertyKey, V, receiver?) -> bool |
|
.setPrototypeOf(target, proto) -> bool (required __proto__ - IE11+) |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js(/library)/es6/reflect |
|
core-js(/library)/fn/reflect |
|
core-js(/library)/fn/reflect/apply |
|
core-js(/library)/fn/reflect/construct |
|
core-js(/library)/fn/reflect/define-property |
|
core-js(/library)/fn/reflect/delete-property |
|
core-js(/library)/fn/reflect/enumerate (deprecated and will be removed from the next major release) |
|
core-js(/library)/fn/reflect/get |
|
core-js(/library)/fn/reflect/get-own-property-descriptor |
|
core-js(/library)/fn/reflect/get-prototype-of |
|
core-js(/library)/fn/reflect/has |
|
core-js(/library)/fn/reflect/is-extensible |
|
core-js(/library)/fn/reflect/own-keys |
|
core-js(/library)/fn/reflect/prevent-extensions |
|
core-js(/library)/fn/reflect/set |
|
core-js(/library)/fn/reflect/set-prototype-of |
|
``` |
|
[*Examples*](http://goo.gl/gVT0cH): |
|
```js |
|
var O = {a: 1}; |
|
Object.defineProperty(O, 'b', {value: 2}); |
|
O[Symbol('c')] = 3; |
|
Reflect.ownKeys(O); // => ['a', 'b', Symbol(c)] |
|
|
|
function C(a, b){ |
|
this.c = a + b; |
|
} |
|
|
|
var instance = Reflect.construct(C, [20, 22]); |
|
instance.c; // => 42 |
|
``` |
|
|
|
### ECMAScript 7+ proposals |
|
[The TC39 process.](https://tc39.github.io/process-document/) |
|
|
|
[*CommonJS entry points:*](#commonjs) |
|
``` |
|
core-js(/library)/es7 |
|
core-js(/library)/es7/array |
|
core-js(/library)/es7/global |
|
core-js(/library)/es7/string |
|
core-js(/library)/es7/map |
|
core-js(/library)/es7/set |
|
core-js(/library)/es7/error |
|
core-js(/library)/es7/math |
|
core-js(/library)/es7/system |
|
core-js(/library)/es7/symbol |
|
core-js(/library)/es7/reflect |
|
core-js(/library)/es7/observable |
|
``` |
|
`core-js/stage/4` entry point contains only stage 4 proposals, `core-js/stage/3` - stage 3 and stage 4, etc. |
|
#### Stage 4 proposals |
|
|
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/stage/4 |
|
``` |
|
* `{Array, %TypedArray%}#includes` [proposal](https://github.com/tc39/Array.prototype.includes) - module [`es7.array.includes`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.array.includes.js), `%TypedArray%` version in modules from [this section](#ecmascript-6-typed-arrays). |
|
```js |
|
Array |
|
#includes(var, from?) -> bool |
|
{ |
|
Int8Array, |
|
Uint8Array, |
|
Uint8ClampedArray, |
|
Int16Array, |
|
Uint16Array, |
|
Int32Array, |
|
Uint32Array, |
|
Float32Array, |
|
Float64Array |
|
} |
|
#includes(var, from?) -> bool |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/array/includes |
|
``` |
|
[*Examples*](http://goo.gl/2Gq4ma): |
|
```js |
|
[1, 2, 3].includes(2); // => true |
|
[1, 2, 3].includes(4); // => false |
|
[1, 2, 3].includes(2, 2); // => false |
|
|
|
[NaN].indexOf(NaN); // => -1 |
|
[NaN].includes(NaN); // => true |
|
Array(1).indexOf(undefined); // => -1 |
|
Array(1).includes(undefined); // => true |
|
``` |
|
* `Object.values`, `Object.entries` [proposal](https://github.com/tc39/proposal-object-values-entries) - modules [`es7.object.values`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.object.values.js), [`es7.object.entries`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.object.entries.js) |
|
```js |
|
Object |
|
.values(object) -> array |
|
.entries(object) -> array |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/object/values |
|
core-js(/library)/fn/object/entries |
|
``` |
|
[*Examples*](http://goo.gl/6kuGOn): |
|
```js |
|
Object.values({a: 1, b: 2, c: 3}); // => [1, 2, 3] |
|
Object.entries({a: 1, b: 2, c: 3}); // => [['a', 1], ['b', 2], ['c', 3]] |
|
|
|
for(let [key, value] of Object.entries({a: 1, b: 2, c: 3})){ |
|
console.log(key); // => 'a', 'b', 'c' |
|
console.log(value); // => 1, 2, 3 |
|
} |
|
``` |
|
* `Object.getOwnPropertyDescriptors` [proposal](https://github.com/tc39/proposal-object-getownpropertydescriptors) - module [`es7.object.get-own-property-descriptors`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.object.get-own-property-descriptors.js) |
|
```js |
|
Object |
|
.getOwnPropertyDescriptors(object) -> object |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/object/get-own-property-descriptors |
|
``` |
|
*Examples*: |
|
```js |
|
// Shallow object cloning with prototype and descriptors: |
|
var copy = Object.create(Object.getPrototypeOf(O), Object.getOwnPropertyDescriptors(O)); |
|
// Mixin: |
|
Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); |
|
``` |
|
* `String#padStart`, `String#padEnd` [proposal](https://github.com/tc39/proposal-string-pad-start-end) - modules [`es7.string.pad-start`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.string.pad-start.js), [`es7.string.pad-end`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.string.pad-end.js) |
|
```js |
|
String |
|
#padStart(length, fillStr = ' ') -> string |
|
#padEnd(length, fillStr = ' ') -> string |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/string/pad-start |
|
core-js(/library)/fn/string/pad-end |
|
core-js(/library)/fn/string/virtual/pad-start |
|
core-js(/library)/fn/string/virtual/pad-end |
|
``` |
|
[*Examples*](http://goo.gl/hK5ccv): |
|
```js |
|
'hello'.padStart(10); // => ' hello' |
|
'hello'.padStart(10, '1234'); // => '12341hello' |
|
'hello'.padEnd(10); // => 'hello ' |
|
'hello'.padEnd(10, '1234'); // => 'hello12341' |
|
``` |
|
* `Object#__(define|lookup)[GS]etter__`, [annex B ES2017](https://github.com/tc39/ecma262/pull/381), but we haven't special namespace for that - modules [`es7.object.define-setter`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.object.define-setter.js), [`es7.object.define-getter`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.object.define-getter.js), [`es7.object.lookup-setter`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.object.lookup-setter.js) and [`es7.object.lookup-getter`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.object.lookup-getter.js). |
|
```js |
|
Object |
|
#__defineSetter__(key, fn) -> void |
|
#__defineGetter__(key, fn) -> void |
|
#__lookupSetter__(key) -> fn | void |
|
#__lookupGetter__(key) -> fn | void |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/object/define-getter |
|
core-js(/library)/fn/object/define-setter |
|
core-js(/library)/fn/object/lookup-getter |
|
core-js(/library)/fn/object/lookup-setter |
|
``` |
|
|
|
#### Stage 3 proposals |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/stage/3 |
|
``` |
|
* `global` [proposal](https://github.com/tc39/proposal-global) - modules [`es7.global`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.global.js) and [`es7.system.global`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.system.global.js) (obsolete) |
|
```js |
|
global -> object |
|
System |
|
.global -> object (obsolete) |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/global |
|
core-js(/library)/fn/system/global (obsolete) |
|
``` |
|
[*Examples*](http://goo.gl/gEqMl7): |
|
```js |
|
global.Array === Array; // => true |
|
``` |
|
* `Promise#finally` [proposal](https://github.com/tc39/proposal-promise-finally) - module [`es7.promise.finally`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.promise.finally.js) |
|
```js |
|
Promise |
|
#finally(onFinally()) -> promise |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/promise/finally |
|
``` |
|
[*Examples*](https://goo.gl/AhyBbJ): |
|
```js |
|
Promise.resolve(42).finally(() => console.log('You will see it anyway')); |
|
|
|
Promise.reject(42).finally(() => console.log('You will see it anyway')); |
|
|
|
#### Stage 2 proposals |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/stage/2 |
|
``` |
|
* `String#trimLeft`, `String#trimRight` / `String#trimStart`, `String#trimEnd` [proposal](https://github.com/sebmarkbage/ecmascript-string-left-right-trim) - modules [`es7.string.trim-left`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.string.trim-right.js), [`es7.string.trim-right`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.string.trim-right.js) |
|
```js |
|
String |
|
#trimLeft() -> string |
|
#trimRight() -> string |
|
#trimStart() -> string |
|
#trimEnd() -> string |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/string/trim-start |
|
core-js(/library)/fn/string/trim-end |
|
core-js(/library)/fn/string/trim-left |
|
core-js(/library)/fn/string/trim-right |
|
core-js(/library)/fn/string/virtual/trim-start |
|
core-js(/library)/fn/string/virtual/trim-end |
|
core-js(/library)/fn/string/virtual/trim-left |
|
core-js(/library)/fn/string/virtual/trim-right |
|
``` |
|
[*Examples*](http://goo.gl/Er5lMJ): |
|
```js |
|
' hello '.trimLeft(); // => 'hello ' |
|
' hello '.trimRight(); // => ' hello' |
|
``` |
|
``` |
|
* `Symbol.asyncIterator` for [async iteration proposal](https://github.com/tc39/proposal-async-iteration) - module [`es7.symbol.async-iterator`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.symbol.async-iterator.js) |
|
```js |
|
Symbol |
|
.asyncIterator -> @@asyncIterator |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/symbol/async-iterator |
|
``` |
|
|
|
#### Stage 1 proposals |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/stage/1 |
|
``` |
|
* `Promise.try` [proposal](https://github.com/tc39/proposal-promise-try) - module [`es7.promise.try`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.promise.try.js) |
|
```js |
|
Promise |
|
.try(function()) -> promise |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/promise/try |
|
``` |
|
[*Examples*](https://goo.gl/k5GGRo): |
|
```js |
|
Promise.try(() => 42).then(it => console.log(`Promise, resolved as ${it}`)); |
|
|
|
Promise.try(() => { throw 42; }).catch(it => console.log(`Promise, rejected as ${it}`)); |
|
``` |
|
* `Array#flatten` and `Array#flatMap` [proposal](https://tc39.github.io/proposal-flatMap) - modules [`es7.array.flatten`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.array.flatten.js) and [`es7.array.flat-map`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.array.flat-map.js) |
|
```js |
|
Array |
|
#flatten(depthArg = 1) -> array |
|
#flatMap(fn(val, key, @), that) -> array |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/array/flatten |
|
core-js(/library)/fn/array/flat-map |
|
core-js(/library)/fn/array/virtual/flatten |
|
core-js(/library)/fn/array/virtual/flat-map |
|
``` |
|
[*Examples*](https://goo.gl/jTXsZi): |
|
```js |
|
[1, [2, 3], [4, 5]].flatten(); // => [1, 2, 3, 4, 5] |
|
[1, [2, [3, [4]]], 5].flatten(); // => [1, 2, [3, [4]], 5] |
|
[1, [2, [3, [4]]], 5].flatten(3); // => [1, 2, 3, 4, 5] |
|
|
|
[{a: 1, b: 2}, {a: 3, b: 4}, {a: 5, b: 6}].flatMap(it => [it.a, it.b]); // => [1, 2, 3, 4, 5, 6] |
|
``` |
|
* `.of` and `.from` methods on collection constructors [proposal](https://github.com/tc39/proposal-setmap-offrom) - modules [`es7.set.of`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.set.of.js), [`es7.set.from`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.set.from.js), [`es7.map.of`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.map.of.js), [`es7.map.from`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.map.from.js), [`es7.weak-set.of`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.weak-set.of.js), [`es7.weak-set.from`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.weak-set.from.js), [`es7.weak-map.of`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.weak-map.of.js), [`es7.weak-map.from`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.weak-map.from.js) |
|
```js |
|
Set |
|
.of(...args) -> set |
|
.from(iterable, mapFn(val, index)?, that?) -> set |
|
Map |
|
.of(...args) -> map |
|
.from(iterable, mapFn(val, index)?, that?) -> map |
|
WeakSet |
|
.of(...args) -> weakset |
|
.from(iterable, mapFn(val, index)?, that?) -> weakset |
|
WeakMap |
|
.of(...args) -> weakmap |
|
.from(iterable, mapFn(val, index)?, that?) -> weakmap |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/set/of |
|
core-js(/library)/fn/set/from |
|
core-js(/library)/fn/map/of |
|
core-js(/library)/fn/map/from |
|
core-js(/library)/fn/weak-set/of |
|
core-js(/library)/fn/weak-set/from |
|
core-js(/library)/fn/weak-map/of |
|
core-js(/library)/fn/weak-map/from |
|
``` |
|
[*Examples*](https://goo.gl/mSC7eU): |
|
```js |
|
Set.of(1, 2, 3, 2, 1); // => Set {1, 2, 3} |
|
|
|
Map.from([[1, 2], [3, 4]], ([key, val]) => [key ** 2, val ** 2]); // => Map {1: 4, 9: 16} |
|
``` |
|
* `String#matchAll` [proposal](https://github.com/tc39/String.prototype.matchAll) - module [`es7.string.match-all`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.string.match-all.js) |
|
```js |
|
String |
|
#matchAll(regexp) -> iterator |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/string/match-all |
|
core-js(/library)/fn/string/virtual/match-all |
|
``` |
|
[*Examples*](http://goo.gl/6kp9EB): |
|
```js |
|
for(let [_, d, D] of '1111a2b3cccc'.matchAll(/(\d)(\D)/)){ |
|
console.log(d, D); // => 1 a, 2 b, 3 c |
|
} |
|
``` |
|
* `Observable` [proposal](https://github.com/zenparsing/es-observable) - modules [`es7.observable`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.observable.js) and [`es7.symbol.observable`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.symbol.observable.js) |
|
```js |
|
new Observable(fn) -> observable |
|
#subscribe(observer) -> subscription |
|
#forEach(fn) -> promise |
|
#@@observable() -> @ |
|
.of(...items) -> observable |
|
.from(observable | iterable) -> observable |
|
.@@species -> @ |
|
Symbol |
|
.observable -> @@observable |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/observable |
|
core-js(/library)/fn/symbol/observable |
|
``` |
|
[*Examples*](http://goo.gl/1LDywi): |
|
```js |
|
new Observable(observer => { |
|
observer.next('hello'); |
|
observer.next('world'); |
|
observer.complete(); |
|
}).forEach(it => console.log(it)) |
|
.then(_ => console.log('!')); |
|
``` |
|
* `Math.{clamp, DEG_PER_RAD, degrees, fscale, rad-per-deg, radians, scale}` |
|
[proposal](https://github.com/rwaldron/proposal-math-extensions) - modules |
|
[`es7.math.clamp`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.math.clamp.js), |
|
[`es7.math.DEG_PER_RAD`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.math.DEG_PER_RAD.js), |
|
[`es7.math.degrees`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.math.degrees.js), |
|
[`es7.math.fscale`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.math.fscale.js), |
|
[`es7.math.RAD_PER_DEG`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.math.RAD_PER_DEG.js), |
|
[`es7.math.radians`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.math.radians.js) and |
|
[`es7.math.scale`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.math.scale.js) |
|
```js |
|
Math |
|
.DEG_PER_RAD -> number |
|
.RAD_PER_DEG -> number |
|
.clamp(x, lower, upper) -> number |
|
.degrees(radians) -> number |
|
.fscale(x, inLow, inHigh, outLow, outHigh) -> number |
|
.radians(degrees) -> number |
|
.scale(x, inLow, inHigh, outLow, outHigh) -> number |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/math/clamp |
|
core-js(/library)/fn/math/deg-per-rad |
|
core-js(/library)/fn/math/degrees |
|
core-js(/library)/fn/math/fscale |
|
core-js(/library)/fn/math/rad-per-deg |
|
core-js(/library)/fn/math/radians |
|
core-js(/library)/fn/math/scale |
|
``` |
|
* `Math.signbit` [proposal](http://jfbastien.github.io/papers/Math.signbit.html) - module [`es7.math.signbit`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.math.signbit.js) |
|
```js |
|
Math |
|
.signbit(x) -> bool |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/math/signbit |
|
``` |
|
[*Examples*](http://es6.zloirock.ru/): |
|
```js |
|
Math.signbit(NaN); // => NaN |
|
Math.signbit(1); // => true |
|
Math.signbit(-1); // => false |
|
Math.signbit(0); // => true |
|
Math.signbit(-0); // => false |
|
``` |
|
|
|
#### Stage 0 proposals |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/stage/0 |
|
``` |
|
* `String#at` [proposal](https://github.com/mathiasbynens/String.prototype.at) - module [`es7.string.at`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.string.at.js) |
|
```js |
|
String |
|
#at(index) -> string |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/string/at |
|
core-js(/library)/fn/string/virtual/at |
|
``` |
|
[*Examples*](http://goo.gl/XluXI8): |
|
```js |
|
'a𠮷b'.at(1); // => '𠮷' |
|
'a𠮷b'.at(1).length; // => 2 |
|
``` |
|
* `Map#toJSON`, `Set#toJSON` [proposal](https://github.com/DavidBruant/Map-Set.prototype.toJSON) - modules [`es7.map.to-json`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.map.to-json.js), [`es7.set.to-json`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.set.to-json.js) (rejected and will be removed from `core-js@3`) |
|
```js |
|
Map |
|
#toJSON() -> array (rejected and will be removed from core-js@3) |
|
Set |
|
#toJSON() -> array (rejected and will be removed from core-js@3) |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/map |
|
core-js(/library)/fn/set |
|
``` |
|
* `Error.isError` [proposal](https://github.com/ljharb/proposal-is-error) - module [`es7.error.is-error`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.error.is-error.js) (withdrawn and will be removed from `core-js@3`) |
|
```js |
|
Error |
|
.isError(it) -> bool (withdrawn and will be removed from core-js@3) |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/error/is-error |
|
``` |
|
* `Math.{iaddh, isubh, imulh, umulh}` [proposal](https://gist.github.com/BrendanEich/4294d5c212a6d2254703) - modules [`es7.math.iaddh`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.math.iaddh.js), [`es7.math.isubh`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.math.isubh.js), [`es7.math.imulh`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.math.imulh.js) and [`es7.math.umulh`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.math.umulh.js) |
|
```js |
|
Math |
|
.iaddh(lo0, hi0, lo1, hi1) -> int32 |
|
.isubh(lo0, hi0, lo1, hi1) -> int32 |
|
.imulh(a, b) -> int32 |
|
.umulh(a, b) -> uint32 |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/math/iaddh |
|
core-js(/library)/fn/math/isubh |
|
core-js(/library)/fn/math/imulh |
|
core-js(/library)/fn/math/umulh |
|
``` |
|
* `global.asap`, [TC39 discussion](https://github.com/rwaldron/tc39-notes/blob/master/es6/2014-09/sept-25.md#510-globalasap-for-enqueuing-a-microtask), module [`es7.asap`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.asap.js) |
|
```js |
|
asap(fn) -> void |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/asap |
|
``` |
|
[*Examples*](http://goo.gl/tx3SRK): |
|
```js |
|
asap(() => console.log('called as microtask')); |
|
``` |
|
|
|
#### Pre-stage 0 proposals |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/stage/pre |
|
``` |
|
* `Reflect` metadata [proposal](https://github.com/jonathandturner/decorators/blob/master/specs/metadata.md) - modules [`es7.reflect.define-metadata`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.reflect.define-metadata.js), [`es7.reflect.delete-metadata`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.reflect.delete-metadata.js), [`es7.reflect.get-metadata`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.reflect.get-metadata.js), [`es7.reflect.get-metadata-keys`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.reflect.get-metadata-keys.js), [`es7.reflect.get-own-metadata`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.reflect.get-own-metadata.js), [`es7.reflect.get-own-metadata-keys`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.reflect.get-own-metadata-keys.js), [`es7.reflect.has-metadata`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.reflect.has-metadata.js), [`es7.reflect.has-own-metadata`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.reflect.has-own-metadata.js) and [`es7.reflect.metadata`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/es7.reflect.metadata.js). |
|
```js |
|
Reflect |
|
.defineMetadata(metadataKey, metadataValue, target, propertyKey?) -> void |
|
.getMetadata(metadataKey, target, propertyKey?) -> var |
|
.getOwnMetadata(metadataKey, target, propertyKey?) -> var |
|
.hasMetadata(metadataKey, target, propertyKey?) -> bool |
|
.hasOwnMetadata(metadataKey, target, propertyKey?) -> bool |
|
.deleteMetadata(metadataKey, target, propertyKey?) -> bool |
|
.getMetadataKeys(target, propertyKey?) -> array |
|
.getOwnMetadataKeys(target, propertyKey?) -> array |
|
.metadata(metadataKey, metadataValue) -> decorator(target, targetKey?) -> void |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/reflect/define-metadata |
|
core-js(/library)/fn/reflect/delete-metadata |
|
core-js(/library)/fn/reflect/get-metadata |
|
core-js(/library)/fn/reflect/get-metadata-keys |
|
core-js(/library)/fn/reflect/get-own-metadata |
|
core-js(/library)/fn/reflect/get-own-metadata-keys |
|
core-js(/library)/fn/reflect/has-metadata |
|
core-js(/library)/fn/reflect/has-own-metadata |
|
core-js(/library)/fn/reflect/metadata |
|
``` |
|
[*Examples*](http://goo.gl/KCo3PS): |
|
```js |
|
var O = {}; |
|
Reflect.defineMetadata('foo', 'bar', O); |
|
Reflect.ownKeys(O); // => [] |
|
Reflect.getOwnMetadataKeys(O); // => ['foo'] |
|
Reflect.getOwnMetadata('foo', O); // => 'bar' |
|
``` |
|
|
|
### Web standards |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/web |
|
``` |
|
#### setTimeout / setInterval |
|
Module [`web.timers`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/web.timers.js). Additional arguments fix for IE9-. |
|
```js |
|
setTimeout(fn(...args), time, ...args) -> id |
|
setInterval(fn(...args), time, ...args) -> id |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/web/timers |
|
core-js(/library)/fn/set-timeout |
|
core-js(/library)/fn/set-interval |
|
``` |
|
```js |
|
// Before: |
|
setTimeout(log.bind(null, 42), 1000); |
|
// After: |
|
setTimeout(log, 1000, 42); |
|
``` |
|
#### setImmediate |
|
Module [`web.immediate`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/web.immediate.js). [`setImmediate` proposal](https://developer.mozilla.org/en-US/docs/Web/API/Window.setImmediate) polyfill. |
|
```js |
|
setImmediate(fn(...args), ...args) -> id |
|
clearImmediate(id) -> void |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/web/immediate |
|
core-js(/library)/fn/set-immediate |
|
core-js(/library)/fn/clear-immediate |
|
``` |
|
[*Examples*](http://goo.gl/6nXGrx): |
|
```js |
|
setImmediate(function(arg1, arg2){ |
|
console.log(arg1, arg2); // => Message will be displayed with minimum delay |
|
}, 'Message will be displayed', 'with minimum delay'); |
|
|
|
clearImmediate(setImmediate(function(){ |
|
console.log('Message will not be displayed'); |
|
})); |
|
``` |
|
#### Iterable DOM collections |
|
Some DOM collections should have [iterable interface](https://heycam.github.io/webidl/#idl-iterable) or should be [inherited from `Array`](https://heycam.github.io/webidl/#LegacyArrayClass). That mean they should have `keys`, `values`, `entries` and `@@iterator` methods for iteration. So add them. Module [`web.dom.iterable`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/web.dom.iterable.js): |
|
```js |
|
{ |
|
CSSRuleList, |
|
CSSStyleDeclaration, |
|
CSSValueList, |
|
ClientRectList, |
|
DOMRectList, |
|
DOMStringList, |
|
DOMTokenList, |
|
DataTransferItemList, |
|
FileList, |
|
HTMLAllCollection, |
|
HTMLCollection, |
|
HTMLFormElement, |
|
HTMLSelectElement, |
|
MediaList, |
|
MimeTypeArray, |
|
NamedNodeMap, |
|
NodeList, |
|
PaintRequestList, |
|
Plugin, |
|
PluginArray, |
|
SVGLengthList, |
|
SVGNumberList, |
|
SVGPathSegList, |
|
SVGPointList, |
|
SVGStringList, |
|
SVGTransformList, |
|
SourceBufferList, |
|
StyleSheetList, |
|
TextTrackCueList, |
|
TextTrackList, |
|
TouchList |
|
} |
|
#@@iterator() -> iterator (values) |
|
|
|
{ |
|
DOMTokenList, |
|
NodeList |
|
} |
|
#values() -> iterator |
|
#keys() -> iterator |
|
#entries() -> iterator |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/web/dom-collections |
|
core-js(/library)/fn/dom-collections/iterator |
|
``` |
|
[*Examples*](http://goo.gl/lfXVFl): |
|
```js |
|
for(var {id} of document.querySelectorAll('*')){ |
|
if(id)console.log(id); |
|
} |
|
|
|
for(var [index, {id}] of document.querySelectorAll('*').entries()){ |
|
if(id)console.log(index, id); |
|
} |
|
``` |
|
### Non-standard |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/core |
|
``` |
|
#### Object |
|
Modules [`core.object.is-object`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.object.is-object.js), [`core.object.classof`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.object.classof.js), [`core.object.define`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.object.define.js), [`core.object.make`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.object.make.js). |
|
```js |
|
Object |
|
.isObject(var) -> bool |
|
.classof(var) -> string |
|
.define(target, mixin) -> target |
|
.make(proto | null, mixin?) -> object |
|
``` |
|
|
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/core/object |
|
core-js(/library)/fn/object/is-object |
|
core-js(/library)/fn/object/define |
|
core-js(/library)/fn/object/make |
|
``` |
|
Object classify [*examples*](http://goo.gl/YZQmGo): |
|
```js |
|
Object.isObject({}); // => true |
|
Object.isObject(isNaN); // => true |
|
Object.isObject(null); // => false |
|
|
|
var classof = Object.classof; |
|
|
|
classof(null); // => 'Null' |
|
classof(undefined); // => 'Undefined' |
|
classof(1); // => 'Number' |
|
classof(true); // => 'Boolean' |
|
classof('string'); // => 'String' |
|
classof(Symbol()); // => 'Symbol' |
|
|
|
classof(new Number(1)); // => 'Number' |
|
classof(new Boolean(true)); // => 'Boolean' |
|
classof(new String('string')); // => 'String' |
|
|
|
var fn = function(){} |
|
, list = (function(){return arguments})(1, 2, 3); |
|
|
|
classof({}); // => 'Object' |
|
classof(fn); // => 'Function' |
|
classof([]); // => 'Array' |
|
classof(list); // => 'Arguments' |
|
classof(/./); // => 'RegExp' |
|
classof(new TypeError); // => 'Error' |
|
|
|
classof(new Set); // => 'Set' |
|
classof(new Map); // => 'Map' |
|
classof(new WeakSet); // => 'WeakSet' |
|
classof(new WeakMap); // => 'WeakMap' |
|
classof(new Promise(fn)); // => 'Promise' |
|
|
|
classof([].values()); // => 'Array Iterator' |
|
classof(new Set().values()); // => 'Set Iterator' |
|
classof(new Map().values()); // => 'Map Iterator' |
|
|
|
classof(Math); // => 'Math' |
|
classof(JSON); // => 'JSON' |
|
|
|
function Example(){} |
|
Example.prototype[Symbol.toStringTag] = 'Example'; |
|
|
|
classof(new Example); // => 'Example' |
|
``` |
|
`Object.define` and `Object.make` [*examples*](http://goo.gl/rtpD5Z): |
|
```js |
|
// Before: |
|
Object.defineProperty(target, 'c', { |
|
enumerable: true, |
|
configurable: true, |
|
get: function(){ |
|
return this.a + this.b; |
|
} |
|
}); |
|
|
|
// After: |
|
Object.define(target, { |
|
get c(){ |
|
return this.a + this.b; |
|
} |
|
}); |
|
|
|
// Shallow object cloning with prototype and descriptors: |
|
var copy = Object.make(Object.getPrototypeOf(src), src); |
|
|
|
// Simple inheritance: |
|
function Vector2D(x, y){ |
|
this.x = x; |
|
this.y = y; |
|
} |
|
Object.define(Vector2D.prototype, { |
|
get xy(){ |
|
return Math.hypot(this.x, this.y); |
|
} |
|
}); |
|
function Vector3D(x, y, z){ |
|
Vector2D.apply(this, arguments); |
|
this.z = z; |
|
} |
|
Vector3D.prototype = Object.make(Vector2D.prototype, { |
|
constructor: Vector3D, |
|
get xyz(){ |
|
return Math.hypot(this.x, this.y, this.z); |
|
} |
|
}); |
|
|
|
var vector = new Vector3D(9, 12, 20); |
|
console.log(vector.xy); // => 15 |
|
console.log(vector.xyz); // => 25 |
|
vector.y++; |
|
console.log(vector.xy); // => 15.811388300841896 |
|
console.log(vector.xyz); // => 25.495097567963924 |
|
``` |
|
#### Dict |
|
Module [`core.dict`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.dict.js). Based on [TC39 discuss](https://github.com/rwaldron/tc39-notes/blob/master/es6/2012-11/nov-29.md#collection-apis-review) / [strawman](http://wiki.ecmascript.org/doku.php?id=harmony:modules_standard#dictionaries). |
|
```js |
|
[new] Dict(iterable (entries) | object ?) -> dict |
|
.isDict(var) -> bool |
|
.values(object) -> iterator |
|
.keys(object) -> iterator |
|
.entries(object) -> iterator (entries) |
|
.has(object, key) -> bool |
|
.get(object, key) -> val |
|
.set(object, key, value) -> object |
|
.forEach(object, fn(val, key, @), that) -> void |
|
.map(object, fn(val, key, @), that) -> new @ |
|
.mapPairs(object, fn(val, key, @), that) -> new @ |
|
.filter(object, fn(val, key, @), that) -> new @ |
|
.some(object, fn(val, key, @), that) -> bool |
|
.every(object, fn(val, key, @), that) -> bool |
|
.find(object, fn(val, key, @), that) -> val |
|
.findKey(object, fn(val, key, @), that) -> key |
|
.keyOf(object, var) -> key |
|
.includes(object, var) -> bool |
|
.reduce(object, fn(memo, val, key, @), memo?) -> var |
|
``` |
|
|
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/core/dict |
|
core-js(/library)/fn/dict |
|
``` |
|
`Dict` create object without prototype from iterable or simple object. |
|
|
|
[*Examples*](http://goo.gl/pnp8Vr): |
|
```js |
|
var map = new Map([['a', 1], ['b', 2], ['c', 3]]); |
|
|
|
Dict(); // => {__proto__: null} |
|
Dict({a: 1, b: 2, c: 3}); // => {__proto__: null, a: 1, b: 2, c: 3} |
|
Dict(map); // => {__proto__: null, a: 1, b: 2, c: 3} |
|
Dict([1, 2, 3].entries()); // => {__proto__: null, 0: 1, 1: 2, 2: 3} |
|
|
|
var dict = Dict({a: 42}); |
|
dict instanceof Object; // => false |
|
dict.a; // => 42 |
|
dict.toString; // => undefined |
|
'a' in dict; // => true |
|
'hasOwnProperty' in dict; // => false |
|
|
|
Dict.isDict({}); // => false |
|
Dict.isDict(Dict()); // => true |
|
``` |
|
`Dict.keys`, `Dict.values` and `Dict.entries` returns iterators for objects. |
|
|
|
[*Examples*](http://goo.gl/xAvECH): |
|
```js |
|
var dict = {a: 1, b: 2, c: 3}; |
|
|
|
for(var key of Dict.keys(dict))console.log(key); // => 'a', 'b', 'c' |
|
|
|
for(var val of Dict.values(dict))console.log(val); // => 1, 2, 3 |
|
|
|
for(var [key, val] of Dict.entries(dict)){ |
|
console.log(key); // => 'a', 'b', 'c' |
|
console.log(val); // => 1, 2, 3 |
|
} |
|
|
|
new Map(Dict.entries(dict)); // => Map {a: 1, b: 2, c: 3} |
|
``` |
|
Basic dict operations for objects with prototype [*examples*](http://goo.gl/B28UnG): |
|
```js |
|
'q' in {q: 1}; // => true |
|
'toString' in {}; // => true |
|
|
|
Dict.has({q: 1}, 'q'); // => true |
|
Dict.has({}, 'toString'); // => false |
|
|
|
({q: 1})['q']; // => 1 |
|
({}).toString; // => function toString(){ [native code] } |
|
|
|
Dict.get({q: 1}, 'q'); // => 1 |
|
Dict.get({}, 'toString'); // => undefined |
|
|
|
var O = {}; |
|
O['q'] = 1; |
|
O['q']; // => 1 |
|
O['__proto__'] = {w: 2}; |
|
O['__proto__']; // => {w: 2} |
|
O['w']; // => 2 |
|
|
|
var O = {}; |
|
Dict.set(O, 'q', 1); |
|
O['q']; // => 1 |
|
Dict.set(O, '__proto__', {w: 2}); |
|
O['__proto__']; // => {w: 2} |
|
O['w']; // => undefined |
|
``` |
|
Other methods of `Dict` module are static equivalents of `Array.prototype` methods for dictionaries. |
|
|
|
[*Examples*](http://goo.gl/xFi1RH): |
|
```js |
|
var dict = {a: 1, b: 2, c: 3}; |
|
|
|
Dict.forEach(dict, console.log, console); |
|
// => 1, 'a', {a: 1, b: 2, c: 3} |
|
// => 2, 'b', {a: 1, b: 2, c: 3} |
|
// => 3, 'c', {a: 1, b: 2, c: 3} |
|
|
|
Dict.map(dict, function(it){ |
|
return it * it; |
|
}); // => {a: 1, b: 4, c: 9} |
|
|
|
Dict.mapPairs(dict, function(val, key){ |
|
if(key != 'b')return [key + key, val * val]; |
|
}); // => {aa: 1, cc: 9} |
|
|
|
Dict.filter(dict, function(it){ |
|
return it % 2; |
|
}); // => {a: 1, c: 3} |
|
|
|
Dict.some(dict, function(it){ |
|
return it === 2; |
|
}); // => true |
|
|
|
Dict.every(dict, function(it){ |
|
return it === 2; |
|
}); // => false |
|
|
|
Dict.find(dict, function(it){ |
|
return it > 2; |
|
}); // => 3 |
|
Dict.find(dict, function(it){ |
|
return it > 4; |
|
}); // => undefined |
|
|
|
Dict.findKey(dict, function(it){ |
|
return it > 2; |
|
}); // => 'c' |
|
Dict.findKey(dict, function(it){ |
|
return it > 4; |
|
}); // => undefined |
|
|
|
Dict.keyOf(dict, 2); // => 'b' |
|
Dict.keyOf(dict, 4); // => undefined |
|
|
|
Dict.includes(dict, 2); // => true |
|
Dict.includes(dict, 4); // => false |
|
|
|
Dict.reduce(dict, function(memo, it){ |
|
return memo + it; |
|
}); // => 6 |
|
Dict.reduce(dict, function(memo, it){ |
|
return memo + it; |
|
}, ''); // => '123' |
|
``` |
|
#### Partial application |
|
Module [`core.function.part`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.function.part.js). |
|
```js |
|
Function |
|
#part(...args | _) -> fn(...args) |
|
``` |
|
|
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js/core/function |
|
core-js(/library)/fn/function/part |
|
core-js(/library)/fn/function/virtual/part |
|
core-js(/library)/fn/_ |
|
``` |
|
`Function#part` partial apply function without `this` binding. Uses global variable `_` (`core._` for builds without global namespace pollution) as placeholder and not conflict with `Underscore` / `LoDash`. |
|
|
|
[*Examples*](http://goo.gl/p9ZJ8K): |
|
```js |
|
var fn1 = log.part(1, 2); |
|
fn1(3, 4); // => 1, 2, 3, 4 |
|
|
|
var fn2 = log.part(_, 2, _, 4); |
|
fn2(1, 3); // => 1, 2, 3, 4 |
|
|
|
var fn3 = log.part(1, _, _, 4); |
|
fn3(2, 3); // => 1, 2, 3, 4 |
|
|
|
fn2(1, 3, 5); // => 1, 2, 3, 4, 5 |
|
fn2(1); // => 1, 2, undefined, 4 |
|
``` |
|
#### Number Iterator |
|
Module [`core.number.iterator`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.number.iterator.js). |
|
```js |
|
Number |
|
#@@iterator() -> iterator |
|
``` |
|
|
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/core/number |
|
core-js(/library)/fn/number/iterator |
|
core-js(/library)/fn/number/virtual/iterator |
|
``` |
|
[*Examples*](http://goo.gl/o45pCN): |
|
```js |
|
for(var i of 3)console.log(i); // => 0, 1, 2 |
|
|
|
[...10]; // => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] |
|
|
|
Array.from(10, Math.random); // => [0.9817775336559862, 0.02720663254149258, ...] |
|
|
|
Array.from(10, function(it){ |
|
return this + it * it; |
|
}, .42); // => [0.42, 1.42, 4.42, 9.42, 16.42, 25.42, 36.42, 49.42, 64.42, 81.42] |
|
``` |
|
#### Escaping strings |
|
Modules [`core.regexp.escape`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.regexp.escape.js), [`core.string.escape-html`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.string.escape-html.js) and [`core.string.unescape-html`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.string.unescape-html.js). |
|
```js |
|
RegExp |
|
.escape(str) -> str |
|
String |
|
#escapeHTML() -> str |
|
#unescapeHTML() -> str |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/core/regexp |
|
core-js(/library)/core/string |
|
core-js(/library)/fn/regexp/escape |
|
core-js(/library)/fn/string/escape-html |
|
core-js(/library)/fn/string/unescape-html |
|
core-js(/library)/fn/string/virtual/escape-html |
|
core-js(/library)/fn/string/virtual/unescape-html |
|
``` |
|
[*Examples*](http://goo.gl/6bOvsQ): |
|
```js |
|
RegExp.escape('Hello, []{}()*+?.\\^$|!'); // => 'Hello, \[\]\{\}\(\)\*\+\?\.\\\^\$\|!' |
|
|
|
'<script>doSomething();</script>'.escapeHTML(); // => '<script>doSomething();</script>' |
|
'<script>doSomething();</script>'.unescapeHTML(); // => '<script>doSomething();</script>' |
|
``` |
|
#### delay |
|
Module [`core.delay`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.delay.js). [Promise](#ecmascript-6-promise)-returning delay function, [esdiscuss](https://esdiscuss.org/topic/promise-returning-delay-function). |
|
```js |
|
delay(ms) -> promise |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/core/delay |
|
core-js(/library)/fn/delay |
|
``` |
|
[*Examples*](http://goo.gl/lbucba): |
|
```js |
|
delay(1e3).then(() => console.log('after 1 sec')); |
|
|
|
(async () => { |
|
await delay(3e3); |
|
console.log('after 3 sec'); |
|
|
|
while(await delay(3e3))console.log('each 3 sec'); |
|
})(); |
|
``` |
|
#### Helpers for iterators |
|
Modules [`core.is-iterable`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.is-iterable.js), [`core.get-iterator`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.get-iterator.js), [`core.get-iterator-method`](https://github.com/zloirock/core-js/blob/v2.6.9/modules/core.get-iterator-method.js) - helpers for check iterability / get iterator in the `library` version or, for example, for `arguments` object: |
|
```js |
|
core |
|
.isIterable(var) -> bool |
|
.getIterator(iterable) -> iterator |
|
.getIteratorMethod(var) -> function | undefined |
|
``` |
|
[*CommonJS entry points:*](#commonjs) |
|
```js |
|
core-js(/library)/fn/is-iterable |
|
core-js(/library)/fn/get-iterator |
|
core-js(/library)/fn/get-iterator-method |
|
``` |
|
[*Examples*](http://goo.gl/SXsM6D): |
|
```js |
|
var list = (function(){ |
|
return arguments; |
|
})(1, 2, 3); |
|
|
|
console.log(core.isIterable(list)); // true; |
|
|
|
var iter = core.getIterator(list); |
|
console.log(iter.next().value); // 1 |
|
console.log(iter.next().value); // 2 |
|
console.log(iter.next().value); // 3 |
|
console.log(iter.next().value); // undefined |
|
|
|
core.getIterator({}); // TypeError: [object Object] is not iterable! |
|
|
|
var iterFn = core.getIteratorMethod(list); |
|
console.log(typeof iterFn); // 'function' |
|
var iter = iterFn.call(list); |
|
console.log(iter.next().value); // 1 |
|
console.log(iter.next().value); // 2 |
|
console.log(iter.next().value); // 3 |
|
console.log(iter.next().value); // undefined |
|
|
|
console.log(core.getIteratorMethod({})); // undefined |
|
``` |
|
|
|
## Missing polyfills |
|
- ES5 `JSON` is missing now only in IE7- and never will it be added to `core-js`, if you need it in these old browsers, many implementations are available, for example, [json3](https://github.com/bestiejs/json3). |
|
- ES6 `String#normalize` is not a very useful feature, but this polyfill will be very large. If you need it, you can use [unorm](https://github.com/walling/unorm/). |
|
- ES6 `Proxy` can't be polyfilled, but for Node.js / Chromium with additional flags you can try [harmony-reflect](https://github.com/tvcutsem/harmony-reflect) for adapt old style `Proxy` API to final ES6 version. |
|
- ES6 logic for `@@isConcatSpreadable` and `@@species` (in most places) can be polyfilled without problems, but it will cause a serious slowdown in popular cases in some engines. It will be polyfilled when it will be implemented in modern engines. |
|
- ES7 `SIMD`. `core-js` doesn't add polyfill of this feature because of large size and some other reasons. You can use [this polyfill](https://github.com/tc39/ecmascript_simd/blob/master/src/ecmascript_simd.js). |
|
- `window.fetch` is not a cross-platform feature, in some environments it makes no sense. For this reason, I don't think it should be in `core-js`. Looking at a large number of requests it *may be* added in the future. Now you can use, for example, [this polyfill](https://github.com/github/fetch). |
|
- ECMA-402 `Intl` is missed because of size. You can use [this polyfill](https://github.com/andyearnshaw/Intl.js/).
|
|
|